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Wordnet 3.0

NOUN (2)

1. any of several different crystalline forms of the same chemical compound;
- Example: "calcium carbonate occurs in the allomorphs calcite and aragonite"

2. a variant phonological representation of a morpheme;
- Example: "the final sounds of `bets' and `beds' and `horses' and `oxen' are allomorphs of the English plural morpheme"


The Collaborative International Dictionary of English v.0.48:

Paramorph \Par"a*morph\, n. [Pref. para- + Gr. morfh` form.] 1. (Min.) A kind of pseudomorph, in which there has been a change of physical characters, by a change in crystal structure without alteration of chemical composition, as the change of aragonite to calcite; called also allomorph. [1913 Webster +PJC] 2. (Biol.) A taxonomic variant observed within a species, for which a more specific term has not been assigned. [PJC] -- par`a*mor"phic, a. -- par`a*mor"phous, a. [PJC]
The Collaborative International Dictionary of English v.0.48:

Allomorph \Al"lo*morph\, n. [Gr. ? other + morfh` form.] (Min.) (a) Any one of two or more distinct crystalline forms of the same substance; or the substance having such forms; -- as, carbonate of lime occurs in the allomorphs calcite and aragonite. (b) A variety of pseudomorph which has undergone partial or complete change or substitution of material; -- thus limonite is frequently an allomorph after pyrite. --G. H. Williams. [1913 Webster]
WordNet (r) 3.0 (2006):

allomorph n 1: any of several different crystalline forms of the same chemical compound; "calcium carbonate occurs in the allomorphs calcite and aragonite" 2: a variant phonological representation of a morpheme; "the final sounds of `bets' and `beds' and `horses' and `oxen' are allomorphs of the English plural morpheme"