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speech disorder
defective ability to speak; it may have either psychogenic or physiologic causes. Congenital causes seen in childhood include
cleft lip, cleft palate, and ankyloglossia. Some neurologic problems, deformities of the larynx or nasal passages, and congenital deafness also cause speech disorders. The most common speech disorders of psychologic origin are stammering and stuttering. See also aphasia, aphonia, dysphasia, and dysphonia.

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