O-epenthesis (Southwestern Ojibwe)

Rule ∅ → o / {m, n} __ + w
Abbreviation oep
Type Synchronic phonological
Notes

Nichols 1980:269: "/o/ is inserted over a morpheme boundary between a nasal consonant and /w/. It also occurs after II stem-final /t/ but not elsewhere after /t/. This rule is limited to verbal inflection."

Sources