iotacism

noun
io·​ta·​cism | \ī-ˈōt-ə-ˌsiz-əm \

Medical Definition of iotacism 

1 : a speech defect marked by use of the sound \ē\ in place of other vowel sounds

2 : a speech defect marked by inability to correctly pronounce the sound \ē\

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obstinately defiant of authority

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