Enantiomer

In chemistry, an enantiomer ( /ɨˈnæntɪ.ɵmər/ ə-NAN-tee-ə-mər; from the Greek ἐνάντιος, opposite, and μέρος, part or portion) is one of two stereoisomers that are mirror images of each other that are non-superposable (not identical), much as one's left and right hands are the same except for opposite orientation.