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1. A speech disorder characterized by hesitation and repetition of words, or by mispronunciation or transposition of certain consonants, especially l, r, and s.
2. Sounds other than speech that are similar to stammering.


, psellismus (sel′ĭzm) (sĕ-liz′mŭs) [Gr. psellisma, stammer]
Defective pronunciation, stuttering, or stammering.

psellismus mercurialis

Jerking, hurried, unintelligible speech present as part of the tremor that accompanies mercury poisoning.