Noun
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.
A variety of pseudomorph which has undergone partial or complete change or substitution of material; -- thus limonite is frequently an allomorph after pyrite.
Source: Webster's dictionarythe final sounds of `bets' and `beds' and `horses' and `oxen' are allomorphs of the English plural morpheme Source: Internet
calcium carbonate occurs in the allomorphs calcite and aragonite Source: Internet