Definition of allomorph noun from the Oxford Advanced American Dictionary

 

allomorph

 noun
noun
NAmE//ˈæləˌmɔrf//
 
(linguistics)
 
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one possible form of a particular morpheme. The forms/s/,/z/, and/əz/ in cats, dogs, and horses are allomorphs of the plural ending s.
See the Oxford Advanced Learner's Dictionary entry: allomorph