Webster's English Dictionary

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allomorph

1. al.lo.morph \'al-*-.mo.rf\ \.al-*-'mo.r-fik\ \'al-*-.mo.r-.fiz-*m\ n 
   [ISV] 1: any of two or more distinct crystalline forms of the same 
   substance  2: a pseudomorph that has undergone change or substitution of 
   material  - al.lo.mor.phic aj
2. allomorph \.al-*-'mo.r-fik\ \'al-*-.mo.r-.fiz-*m\ n [2allo- + morpheme] 
   : one of two or more forms that a morpheme has at different points in the  
   language {the -es /*z/ of dishes, the -s /z/ of dreams, the -s /s/ of 
   traps, the -en /*n/ of oxen, the vowel modification distinguishing teeth 
   from tooth, and the zero suffix of sheep in those sheep are ~s of the same 
   morpheme} - al.lo.mor.phic aj