morphophoneme Syllabification: (mor·pho·pho·neme)Pronunciation: /ˌmôrfəˈfōˌnēm/Definition of morphophoneme noun Phonetics any of the variant forms of a phoneme as determined by the context in which it is used. Derivatives morphophonemicPronunciation: /ˌmôrfōfəˈnēmik/ adjective morphophoneme in other Oxford dictionaries Definition of morphophoneme in the British & World English dictionary