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ABC soil a soil made up of three distinct layers, the A or top layer being humus and organic matter, the B layer being clay and oxidized material, and the C layer being loose rock and mineral materials.
acetal a colorless, flammable, volatile liquid compound used as a solvent, in perfumes and cosmetics, in organic synthesis, and to induce hypnosis. [1/2 definitions]
acetamide a colorless water-soluble crystalline solid used esp. in forming organic compounds.
acetanilide a white crystalline organic powder produced by the effect of acetic acid on aniline and used to relieve pain and fever.
adenosine an organic compound that is made up of adenine and ribose and found in nucleic acids, and that may be obtained as a white crystalline powder through the hydrolysis of yeast.
alcohol any of a class of volatile organic compounds derived from hydrocarbons in which one or more hydroxyl groups replace one or more hydrogen atoms of the parent hydrocarbon. [1/3 definitions]
aldehyde in chemistry, any of a group of organic compounds, such as formaldehyde, the molecule of which contains a terminal carbon atom bound separately to a hydrogen and an oxygen atom.
aliphatic indicating an organic chemical compound in which the carbon atoms make an open chain.
alkaloid any of various nitrogen-containing organic bases found in plants and from which drugs such as nicotine, quinine, and morphine are made.
amide an organic compound derived from ammonia, such as acetamide, or a metallic derivative, such as sodium amide.
amine any of a group of ammonia derivatives in which hydrogen atoms have been replaced by organic groups containing hydrogen and carbon.
amino of, relating to, or containing an amine or other chemical substance formed by anitrogen-hydrogen group in combination with nonacidic organic compounds.
amino acid any of the organic acids necessary to build proteins and sustain life, some of which cannot be synthesized in the body and so must be consumed in the diet.
ammonification the formation of ammonia by bacterial action on nitrogenous organic matter, as in soil. [1/2 definitions]
amygdalin an organic compound derived from bitter almonds and related fruits, used to produce laetrile and as an expectorant.
amyl the small organic molecule derived from pentane; pentyl. [1/2 definitions]
ascorbic acid an organic acid found in many foods, esp. citrus fruits, and required in human nutrition for the production of collagen; vitamin C.
auxin any of a group of organic compounds, often plant hormones, that affect plant growth.
azobenzene an orange-red, nonsoluble crystalline compound obtained from nitrobenzene, used in organic synthesis, as an insecticide, and in the making of dyes.
barbituric acid a white crystalline organic acid, used in polymerization and in the manufacture of sedatives and dyes.
benzoin a white or yellowish crystalline powder used in organic synthesis and in making antiseptics. [1/3 definitions]