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Stutter
Definition 1
A speech disorder characterized by frequent sound or syllable repetitions, sound prolongations, or other dysfluencies that are inappropriate for the individual's age. (NCI Thesaurus)
Definition 2
A disturbance in the normal fluency and time patterning of speech that is inappropriate for the individual's age. This disturbance is characterized by frequent repetitions or prolongations of sounds or syllables. Various other types of speech dysfluencies may also be involved including interjections, broken words, audible or silent blocking, circumlocutions, words produced with an excess of physical tension, and monosyllabic whole word repetitions. Stuttering may occur as a developmental condition in childhood or as an acquired disorder which may be associated with BRAIN INFARCTIONS and other BRAIN DISEASES. (From DSM-IV, 1994) (NLM, Medical Subject Headings)
Definition 3
disorder in which speech is involuntarily interrupted by hesitations, repetitions, and spasms of the muscles involved in breathing or vocalization. (NIH CRISP Thesaurus)