mytacismEtymologyFrom Ancient Greek μυτακισμός (mutakismós, “fondness of the letter mu”). By surface analysis from mu (Greek letter representing /m/) + -tacism.mytacism means A speech disorder manifesting as an abnormal repetition of the sound /m/ or replacement of consonants with m-like sounds. Lexicurio rates it Rare gem — a strength score of 73 out of 100.nounA speech disorder manifesting as an abnormal repetition of the sound /m/ or replacement of consonants with m-like sounds.