'Enantiomer' definitions:

Definition of 'enantiomer'

noun

Either one of a pair of compounds (crystals or molecules) that are mirror images on each other but are not identical [syn: enantiomorph, enantiomer]

From: GCIDE

Enantiomer \E*nan"ti*o*mer\, n. [Gr. 'enanti`os opposite + -mer.] (Chem.) 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. -- {E*nan`ti*o*mer"ic}, a. [PJC]