morphophonemics

noun

mor·​pho·​pho·​ne·​mics ˌmȯr-fō-fə-ˈnē-miks 

plural in form but singular in construction

1

: a study of the phonemic differences between allomorphs of the same morpheme

2

: the distribution of allomorphs in one morpheme

3

: the structure of a language in terms of morphophonemics

Word History

First Known Use

1938, in the meaning defined at sense 1