1) Allomorph 
(from the article `linguistics`) ...not be identified theoretically with units of the kind discussed in the section on Phonology under Structural linguistics. They are closer to what ...
[n] - (linguistics) the phonemes (or strings of phonemes) that constitute the various allomorphs of a morpheme
noun (linguistics) the phonemes (or strings of phonemes) that constitute the various allomorphs of a morpheme
an abstract phonological unit representing corresponding phonemes in different allomorphs of one morpheme. In English the symbol F may be used to represent a morphophoneme occurring in two related allomorphs, as f in leaf, but v in the plural leaves. · a phonological entity comprising a bundle of distinctive features used in the representat...