Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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acetic acid a clear, colorless, sour liquid compound that is the main ingredient in vinegar and is used in solvents, acetate fibers, plastics, and other products.
acetylsalicylic acid aspirin.
acid rain rain that has high acidity because of being mixed with pollutants such as vehicle exhausts and residues from burning of fossil fuels for energy or from chemical manufacturing.
acid rock a form of music popular in the late 1960s and early 1970s that has loud, often distorted sounds and harmonies, and lyrics that suggest psychedelic experiences.
acid test a stringent, crucial, or definitive test of value or quality.
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.
arachidonic acid an unsaturated fatty acid that is an important component of the cell membrane and is considered an essential nutrient in the diet of most mammals, including humans.
arsenic acid a poisonous, water-soluble white powder that is used in the making of arsenates, medicines, and insecticides.
ascorbic acid an organic acid found in many foods, esp. citrus fruits, and required in human nutrition for the production of collagen; vitamin C.
aspartic acid a nonessential amino acid found in proteins.
barbituric acid a white crystalline organic acid, used in polymerization and in the manufacture of sedatives and dyes.
benzoic acid a white crystalline powder used as a preservative and antiseptic in perfumes and flavorings, in synthesizing dyes, and to season tobacco.
boric acid a white crystalline compound used as a mild antiseptic and in making glass, enamels, fireproofing materials, and other products.
bromic acid a poisonous acid that is stable only in very dilute form and is used as an oxidizing agent.
butyric acid an organic acid found in animal milk fats, esp. rancid butter, and used to produce certain fragrances, disinfectants, flavors, and pharmaceuticals.
carbolic acid phenol.
carbonic acid a weak colorless unstable acid, present only in solution, formed by dissolving carbon dioxide in water.
cevitamic acid ascorbic acid.
chromic acid an acid containing chromium that exists only in solution or in the form of its salts.
citric acid an acid derived from the juice of the lime, lemon, or pineapple or from the fermentation of sugars, often used as a flavoring.