The American Heritage® Dictionary of the English Language, 4th Edition
n. See paramorph.
n. Any of the variant forms of a morpheme. For example, the phonetic (s) of cats (kăts), (z) of pigs (pĭgz), and (ĭz) horses (hôrˈsĭz) are allomorphs of the English plural morpheme.
n. Any of the different crystalline forms of a substance.
n. Any of the different phonological representations of a morpheme.
the GNU version of the Collaborative International Dictionary of English
n. Any one of two or more distinct crystalline forms of the same substance; or the substance having such forms; -- .
n. A variety of pseudomorph which has undergone partial or complete change or substitution of material; -- thus limonite is frequently an allomorph after pyrite.
The Century Dictionary and Cyclopedia
n. In mineralogy, a paramorph, that is, a pseudomorph formed by molecular change only, the chemical composition remaining the same, as calcite after aragonite.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any of several different crystalline forms of the same chemical compound
n. a variant phonological representation of a morpheme
Word Usage
"The term allomorph is just linguistobabble for a piece of language, such as a suffix, that shows predictable variation in its form in different positions or circumstances."