01 n. either of a pair of optical isomers of a chemical substance whose molecules are mirror images of each other, i. e., are related to each oth…
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either of a pair of optical isomers of a chemical substance whose molecules are mirror images of each other, i. e., are related to each other as a right-handed to a left-handed glove; -- meaningful only for structures which have internal asymmetry.(Chem.)