Definition of allomorph in English:

allomorph

Pronunciation /ˈaləˌmôrf/ /ˈæləˌmɔrf/

noun

Linguistics
  • Any of the versions of a morpheme, such as the plural endings /s/ (as in bats), /z/ (as in bugs), and /iz/ (as in buses) for the plural morpheme.

    ‘It requires the distribution of allomorphs according to orthographic criteria.’
    • ‘In the analysis, /miso/ can be decomposed into /mi/ ‘three’ and /so/, an allomorph of /to:/ ‘ten’.’

Origin

1940s from allo-‘other, different’ + morpheme.