GNU Collaborative International Dictionary of English

Found one definition

1.       
   Enantiomer (?), n. [Gr. ἐναντίος 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]