| 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. |
| acetophenetidin |
a white powder or crystalline solid used to relieve fever and pain; phenacetin. |
| adenine |
in chemistry, a crystalline base that is a constituent of nucleic acid in organs such as the pancreas and spleen. |
| 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. |
| allomerism |
change in chemical composition without accompanying change in crystalline form. |
| amidol |
a colorless crystalline substance used in developing photographs. |
| ammonium chloride |
a white crystalline salt used in dry cells, in medicine as an expectorant, and in various industrial applications; sal ammoniac. |
| anthracene |
a crystalline hydrocarbon derived from coal tar and used in making dyes and detecting radiation. |
| apomorphine |
a white crystalline alkaloid made from morphine, used as an expectorant and emetic. |
| Archean |
of, relating to, or designating the earlier of two geological periods of the Precambrian Era, ending approximately 2.5 billion years ago, during which highly crystalline igneous and metamorphic rocks were formed; Early Precambrian; Archeozoic; azoic. [1/2 definitions] |
| arsenic |
a poisonous chemical element that has thirty-three protons in each nucleus and occurs in brittle, grayish white crystalline masses or in yellow or black allotropes. (symbol: As) [1/2 definitions] |
| 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. |
| benzoic acid |
a white crystalline powder used as a preservative and antiseptic in perfumes and flavorings, in synthesizing dyes, and to season tobacco. |
| benzoin |
a white or yellowish crystalline powder used in organic synthesis and in making antiseptics. [1/3 definitions] |
| beryl |
a crystalline mineral, aluminum beryllium silicate, from which beryllium and certain gemstones such as emeralds are derived. |
| bismuth |
a chemical element that has eighty-three protons in each nucleus and is a white brittle crystalline metal with very low thermal and electrical conductivity, used chiefly in alloys and medicines. (symbol: Bi) |
| boric acid |
a white crystalline compound used as a mild antiseptic and in making glass, enamels, fireproofing materials, and other products. |
| boron carbide |
a very hard black crystalline compound used in nuclear reactor control rods, as reinforcement in structural materials, and as an abrasive. |
| calcium carbide |
a dark gray crystalline compound used as a dehydrating agent and a source of acetylene gas and calcium cyanimide. |