Definition of microphoneme in US English:

microphoneme

noun

Linguistics
  • W. F. Twaddell's term for: any member of a set of terms exhibiting minimum phonological difference in form.

Origin

1930s. From micro- + phoneme.

Pronunciation

microphoneme

/ˌmʌɪkrə(ʊ)ˈfəʊniːm/