Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Either of a pair of crystals, molecules, or compounds that are mirror images of each other but are not identical, and that rotate the plane of polarized light equally, but in opposite directions. Also called enantiomer, optical isomer.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Mirror image, form related to another as an object is to its image in a mirror.
  • n. Either of a pair of crystals that are mirror images of each other, and are optically active.
  • n. A similar molecule or compound; an enantiomer.

from The Century Dictionary and Cyclopedia

  • n. Noting the stereomeric isomer of a compound containing one or more asymmetric carbon atoms: thus, levorotatory lactic acid is the enantiomorph of the dextrorotatory acid, and vice versa. The word is also used of crystals.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. either one of a pair of compounds (crystals or molecules) that are mirror images on each other but are not identical

Etymologies

Greek enantios, opposite; see ant- in Indo-European roots + -morph.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ἐναντίος (enantios, "opposite") + μορφή (morphē, "form"). (Wiktionary)

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