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chaff
material consisting of seed coverings and small pieces of stem or leaves that have been separated from the seeds
chaff: material consisting of seed coverings and small pieces of stem or leaves that have been separated from the seeds
bran
broken husks of the seeds of cereal grains that are separated from the flour by sifting
bran: broken husks of the seeds of cereal grains that are separated from the flour by sifting
chalcedony
a milky or greyish translucent to transparent quartz
chalcedony: a milky or greyish translucent to transparent quartz
chalk
a soft whitish calcite
chalk: a soft whitish calcite
chamosite
a greenish grey or black silicate of iron and aluminum
chamosite: a greenish grey or black silicate of iron and aluminum
chemical
material produced by or used in a reaction involving changes in atoms or molecules
chemical: material produced by or used in a reaction involving changes in atoms or molecules
neurochemical
any organic substance that occurs in neural activity
neurochemical: any organic substance that occurs in neural activity
neurotransmitter
a neurochemical that transmits nerve impulses across a synapse
neurotransmitter: a neurochemical that transmits nerve impulses across a synapse
monoamine_neurotransmitter
a monoamine that is functionally important in neural transmission
monoamine_neurotransmitter: a monoamine that is functionally important in neural transmission
catecholamine
any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland
catecholamine: any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland
chromophore
the chemical group that gives color to a molecule
chromophore: the chemical group that gives color to a molecule
serotonin
a neurotransmitter involved in e.g. sleep and depression and memory
serotonin: a neurotransmitter involved in e.g. sleep and depression and memory
acetylcholine
a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems
acetylcholine: a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems
acyl_anhydrides
organic compounds that react with water to form an acid
acyl_anhydrides: organic compounds that react with water to form an acid
acyl_halide
organic compounds containing the group -COX where X is a halogen atom
acyl_halide: organic compounds containing the group -COX where X is a halogen atom
acetyl_chloride
colorless liquid acyl chloride (CH3COCl) that has a pungent odor
acetyl_chloride: colorless liquid acyl chloride (CH3COCl) that has a pungent odor
endorphin
a neurochemical occurring naturally in the brain and having analgesic properties
endorphin: a neurochemical occurring naturally in the brain and having analgesic properties
beta_endorphin
an endorphin produced by the pituitary gland that suppresses pain
beta_endorphin: an endorphin produced by the pituitary gland that suppresses pain
enkephalin
an endorphin having opiate qualities that occurs in the brain and spinal cord and elsewhere
enkephalin: an endorphin having opiate qualities that occurs in the brain and spinal cord and elsewhere
cheoplastic_metal
any alloy that fuses at low temperatures and can be used molding artificial teeth
cheoplastic_metal: any alloy that fuses at low temperatures and can be used molding artificial teeth
chernozemic_soil
a rich black loam of Russia
chernozemic_soil: a rich black loam of Russia
chisel_steel
steel used in making chisels
chisel_steel: steel used in making chisels
chlorine_dioxide
an explosive gas (ClO2) used chiefly in bleaching paper or starch or soap or flour and in water purification
chlorine_dioxide: an explosive gas (ClO2) used chiefly in bleaching paper or starch or soap or flour and in water purification
chlorine_water
an aqueous solution of chlorine used as a bleaching agent
chlorine_water: an aqueous solution of chlorine used as a bleaching agent
chloropicrin
a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas
chloropicrin: a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas
nitrochloromethane
gaseous form of chloropicrin used as tear gas
nitrochloromethane: gaseous form of chloropicrin used as tear gas
chlorpyrifos
a common organophosphate insecticide
chlorpyrifos: a common organophosphate insecticide
choline
a B-complex vitamin that is a constituent of lecithin; essential in the metabolism of fat
choline: a B-complex vitamin that is a constituent of lecithin; essential in the metabolism of fat
chrome
another word for chromium when it is used in dyes or pigments
chrome: another word for chromium when it is used in dyes or pigments
chrome-nickel_steel
Elinvar is a trademark for a kind of steel used for watch springs because its elasticity is constant over a wide range of temperatures
chrome-nickel_steel: Elinvar is a trademark for a kind of steel used for watch springs because its elasticity is constant over a wide range of temperatures
chrome-tungsten_steel
a steel alloy made with chromium and tungsten
chrome-tungsten_steel: a steel alloy made with chromium and tungsten
chrome_green
any of a class of green pigments consisting of chrome yellow and iron blue
chrome_green: any of a class of green pigments consisting of chrome yellow and iron blue
Windsor_green
a light chrome green pigment
Windsor_green: a light chrome green pigment
Hooker's_green
green pigment consisting of Prussian blue mixed with gamboge
Hooker's_green: green pigment consisting of Prussian blue mixed with gamboge
chrome_yellow
any of several yellow pigments consisting of normal lead chromate and other lead compounds
chrome_yellow: any of several yellow pigments consisting of normal lead chromate and other lead compounds
chromic_acid
an unstable acid known only in solution and as chromate salts
chromic_acid: an unstable acid known only in solution and as chromate salts
chromate
any salt or ester of chromic acid
chromate: any salt or ester of chromic acid
lead_chromate
a poisonous chromate of lead used as a pigment in paint
lead_chromate: a poisonous chromate of lead used as a pigment in paint
chrysolite
a brown or yellow-green olivine found in igneous and metamorphic rocks and used as a gemstone
chrysolite: a brown or yellow-green olivine found in igneous and metamorphic rocks and used as a gemstone
chrysoprase
a green variety of chalcedony valued as a gemstone
chrysoprase: a green variety of chalcedony valued as a gemstone
chylomicron
a microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood
chylomicron: a microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood
cigarette_paper
a strong tissue paper that burns evenly and is sufficiently porous to control the burning of the tobacco in a cigarette
cigarette_paper: a strong tissue paper that burns evenly and is sufficiently porous to control the burning of the tobacco in a cigarette
cinder_pig
pig iron containing a substantial proportion of slag
cinder_pig: pig iron containing a substantial proportion of slag
citric_acid
a weak water-soluble acid found in many fruits (especially citrus fruits); used as a flavoring agent
citric_acid: a weak water-soluble acid found in many fruits (especially citrus fruits); used as a flavoring agent
citrine
semiprecious yellow quartz resembling topaz
citrine: semiprecious yellow quartz resembling topaz
clay
a very fine-grained soil that is plastic when moist but hard when fired
clay: a very fine-grained soil that is plastic when moist but hard when fired
pipeclay
fine white clay used in making tobacco pipes and pottery and in whitening leather
pipeclay: fine white clay used in making tobacco pipes and pottery and in whitening leather
bentonite
an absorbent aluminum silicate clay formed from volcanic ash
bentonite: an absorbent aluminum silicate clay formed from volcanic ash
fireclay
a heat-resistant clay
fireclay: a heat-resistant clay
Kitty_Litter
granulated clay; placed in a container where it absorbs the waste products of a cat or dog
Kitty_Litter: granulated clay; placed in a container where it absorbs the waste products of a cat or dog
potter's_clay
clay that does not contain any iron; used in making pottery or for modeling
potter's_clay: clay that does not contain any iron; used in making pottery or for modeling
slip
potter's clay that is thinned and used for coating or decorating ceramics
slip: potter's clay that is thinned and used for coating or decorating ceramics
claystone
fine-grained rock consisting of compacted clay particles
claystone: fine-grained rock consisting of compacted clay particles
clunch
hardened clay
clunch: hardened clay
coal
fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period
coal: fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period
anthracite
a hard natural coal that burns slowly and gives intense heat
anthracite: a hard natural coal that burns slowly and gives intense heat
bituminous_coal
rich in tarry hydrocarbons; burns readily with a smoky yellow flame
bituminous_coal: rich in tarry hydrocarbons; burns readily with a smoky yellow flame
lignite
intermediate between peat and bituminous coal
lignite: intermediate between peat and bituminous coal
sea_coal
pulverized bituminous coal; used as a foundry facing
sea_coal: pulverized bituminous coal; used as a foundry facing
steam_coal
coal suitable for use under steam boilers
steam_coal: coal suitable for use under steam boilers
Clorox
a commercial bleaching agent
Clorox: a commercial bleaching agent
coagulant
an agent that produces coagulation
coagulant: an agent that produces coagulation
cod-liver_oil
an oil obtained from the livers of cod and similar fishes; taken orally as a source of vitamins A and D
cod-liver_oil: an oil obtained from the livers of cod and similar fishes; taken orally as a source of vitamins A and D
cod_oil
an inferior cod-liver oil that is used in leather manufacturing
cod_oil: an inferior cod-liver oil that is used in leather manufacturing
lanolin
a yellow viscous animal oil extracted from wool; a mixture of fatty acids and esters; used in some ointments and cosmetics
lanolin: a yellow viscous animal oil extracted from wool; a mixture of fatty acids and esters; used in some ointments and cosmetics
codon
a specific sequence of three adjacent nucleotides on a strand of DNA or RNA that specifies the genetic code information for synthesizing a particular amino acid
codon: a specific sequence of three adjacent nucleotides on a strand of DNA or RNA that specifies the genetic code information for synthesizing a particular amino acid
coin_silver
a silver of the degree of purity established for making legal silver coins
coin_silver: a silver of the degree of purity established for making legal silver coins
combustible
a substance that can be burned to provide heat or power
combustible: a substance that can be burned to provide heat or power
complementary_DNA
single-stranded DNA that is complementary to messenger RNA or DNA that has been synthesized from messenger RNA by reverse transcriptase
complementary_DNA: single-stranded DNA that is complementary to messenger RNA or DNA that has been synthesized from messenger RNA by reverse transcriptase
provirus
cDNA copy of the RNA genome of a retrovirus; the genetic material of a virus as incorporated into and able to replicate with the genome of a host cell
provirus: cDNA copy of the RNA genome of a retrovirus; the genetic material of a virus as incorporated into and able to replicate with the genome of a host cell
dscDNA
double-stranded cDNA
dscDNA: double-stranded cDNA
episome
DNA that is not incorporated into the genome but is replicated together with the genome (especially in bacterial cells)
episome: DNA that is not incorporated into the genome but is replicated together with the genome (especially in bacterial cells)
complex
a compound described in terms of the central atom to which other atoms are bound or coordinated
complex: a compound described in terms of the central atom to which other atoms are bound or coordinated
composite_material
strong lightweight material developed in the laboratory; fibers of more than one kind are bonded together chemically
composite_material: strong lightweight material developed in the laboratory; fibers of more than one kind are bonded together chemically
hydrochloride
a complex consisting of an organic base in association with hydrogen chloride
hydrochloride: a complex consisting of an organic base in association with hydrogen chloride
compost
a mixture of decaying vegetation and manure; used as a fertilizer
compost: a mixture of decaying vegetation and manure; used as a fertilizer
compound
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
compound: (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
allomorph
any of several different crystalline forms of the same chemical compound
allomorph: any of several different crystalline forms of the same chemical compound
computer_paper
paper folded to permit continuous printing controlled by a computer
computer_paper: paper folded to permit continuous printing controlled by a computer
concrete
a strong hard building material composed of sand and gravel and cement and water
concrete: a strong hard building material composed of sand and gravel and cement and water
conjugate_solution
a mixture of two partially miscible liquids A and B produces two conjugate solutions: one of A in B and another of B in A
conjugate_solution: a mixture of two partially miscible liquids A and B produces two conjugate solutions: one of A in B and another of B in A
conima
a gum resin from the poison hemlock, Conium maculatum
conima: a gum resin from the poison hemlock, Conium maculatum
constantan
an alloy of copper and nickel with high electrical resistance and a low temperature coefficient; used as resistance wire
constantan: an alloy of copper and nickel with high electrical resistance and a low temperature coefficient; used as resistance wire
construction_paper
paper suitable for drawing and making cutouts
construction_paper: paper suitable for drawing and making cutouts
conductor
a substance that readily conducts e.g. electricity and heat
conductor: a substance that readily conducts e.g. electricity and heat
semiconductor
a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities
semiconductor: a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities
insulator
a material such as glass or porcelain with negligible electrical or thermal conductivity
insulator: a material such as glass or porcelain with negligible electrical or thermal conductivity
glass_wool
glass fibers spun and massed into bundles resembling wool
glass_wool: glass fibers spun and massed into bundles resembling wool
contaminant
a substance that contaminates
contaminant: a substance that contaminates
coolant
a fluid agent (gas or liquid) that produces cooling; especially one used to cool a system by transferring heat away from one part to another
coolant: a fluid agent (gas or liquid) that produces cooling; especially one used to cool a system by transferring heat away from one part to another
copper-base_alloy
any alloy whose principal component is copper
copper-base_alloy: any alloy whose principal component is copper
copper_oxide
an oxide of copper
copper_oxide: an oxide of copper
copper_sulfate
a copper salt made by the action of sulfuric acid on copper oxide
copper_sulfate: a copper salt made by the action of sulfuric acid on copper oxide
coral
the hard stony skeleton of a Mediterranean coral that has a delicate red or pink color and is used for jewelry
coral: the hard stony skeleton of a Mediterranean coral that has a delicate red or pink color and is used for jewelry
cork
outer bark of the cork oak; used for stoppers for bottles etc.
cork: outer bark of the cork oak; used for stoppers for bottles etc.
corkboard
a heat-insulating building material consisting of cork granules that are made into sheets by compressing and baking
corkboard: a heat-insulating building material consisting of cork granules that are made into sheets by compressing and baking
phellem
(botany) outer tissue of bark; a protective layer of dead cells
phellem: (botany) outer tissue of bark; a protective layer of dead cells
corn_sugar
dextrose made by hydrolysis of cornstarch
corn_sugar: dextrose made by hydrolysis of cornstarch
corrosive
a substance having the tendency to cause corrosion (such a strong acids or alkali)
corrosive: a substance having the tendency to cause corrosion (such a strong acids or alkali)
alumina
any of various forms of aluminum oxide occurring naturally as corundum
alumina: any of various forms of aluminum oxide occurring naturally as corundum