allomorphyoudaoicibaDictYouDict[allomorph 词源字典]
"Any of two or more actual representations of a morpheme, such as the plural endings s (as in bats), z (as in bugs), and ɪz (as in buses)", 1940s: from allo- 'other, different' + morpheme.[allomorph etymology, allomorph origin, 英语词源]