from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to a chemical compound that contains equal quantities of dextrorotatory and levorotatory forms and therefore does not rotate the plane of incident polarized light.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. containing equal amounts of dextrorotatory (D) and levorotatory (L) stereoisomers and therefore not being optically active; typically, will be synthetic rather than natural
from the GNU version of the Collaborative International Dictionary of English
- adj. Pertaining to, or designating, an acid found in many kinds of grapes. It is also obtained from tartaric acid, with which it is isomeric, and from sugar, gum, etc., by oxidation. It is a sour white crystalline substance, consisting of a combination of dextrorotatory and levorotatory tartaric acids.
from The Century Dictionary and Cyclopedia
- Pertaining or relating to grapes in clusters, or to racemes.
- In chem., composed of two optically opposite isomeres. The typical case is that of racemic acid (see below), but racemic forms are of frequent occurrence among organic compounds. The racemic form does not act on polarized light.
From French racémique, from Latin racēmus ("cluster or bunch of grapes") + -ique or from raceme + -ic. (Wiktionary)