Pronunciation: (al'u-môrf"), [key]
1. any of two or more different forms of the same chemical compound.
2. Ling.one of the alternate contextually determined phonological shapes of a morpheme, as en in oxen, which is an allomorph of the English plural morpheme. Cf. morph.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.