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A speech defect marked by the frequent substitution of a long e sound (that of the Greek iota) for other vowels.
[G. iōta, the letter ι]
iotacism(ī-ō′tă-sĭzm) [Gr. iota, letter i]
An abnormal speech pattern marked by the constant substitution of an ē sound (Greek iota) for other vowels.