allomorph

UK: /ˈæləˌmɔːf/ US: (al′ə môrf′)

WordReference Random House Unabridged Dictionary of American English © 2025

al•lo•morph  (al′ə môrf′), n. 

1. Chemistry any of two or more different forms of the same chemical compound.
2. Linguistics 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.
3. Mineralogy paramorph.

• allo- + -morph 1865–70

al′lo•mor′phic, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

allomorph / ˈæləˌmɔːf/ noun

1. any of the phonological representations of a single morpheme. For example, the final (s) and (z) sounds of bets and beds are allomorphs of the English noun-plural morpheme
2. any of two or more different crystalline forms of a chemical compound, such as a mineral

ˌalloˈmorphic adjective