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fragile X syndrome

a widespread form of mental retardation caused by a faulty gene on the X chromosome.
Origin of fragile X syndrome
1980-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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fragile X syndrome in Medicine

fragile X syndrome n.
An inherited disorder causing mental retardation, enlarged testes, and facial abnormalities in males and mild mental retardation in females.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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