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Definition of XXXX syndrome

XXXX syndrome: A chromosome disorder in females caused by the presence of four X chromosomes rather than the usual two. The disorder is characterized by decreased intelligence (IQ 30 to 80; average 55), speech and behavioral problems, tall stature and reduced fertility. Also known as tetra-X syndrome.

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 6/14/2012

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