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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] |
| acetaldehyde |
a colorless, flammable, organic solvent. |
| 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any of a group of ammonia derivatives in which hydrogen atoms have been replaced by organic groups containing hydrogen and carbon.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. |
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