#initial-load-header-loader { visibility: hidden!important; } #initial-load-content { visibility: visible!important; } .expandable .expandable-control { display: none!important; } .expandable .expandable-content { display: block!important; visibility: visible!important; max-height: none!important; height: auto!important; }

fragile X syndrome

noun

a widespread form of mental retardation caused by a faulty gene on the X chromosome.

RELATED CONTENT

impostor syndrome Read more in this article about some frequently asked questions and fun facts related to our definitions.

What The “X” In “Xbox” Stands For?No letter in the English language gets around like X. The 24th letter of the alphabet shows up everywhere, from the popular Xbox to standing in for a signature on legal documents. It represents a chromosome, signifies the multiplication process, and marks “the spot” on treasure maps. Let’s explore just a few of the uses of this versatile letter. The story behind the X in Xbox …

Origin of fragile X syndrome

First recorded in 1980–85

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Medicine definitions for fragile x syndrome

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.