fragile X syndrome

(redirected from marker X syndrome)
Also found in: Medical, Encyclopedia.
Related to marker X syndrome: Macroorchidism, FXTAS

fragile X syndrome

n.
An inherited disorder caused by a defective gene on the X chromosome and marked by intellectual disability, developmental disorders, enlarged testes, and facial abnormalities in males and by mild or no effects in heterozygous females.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

fragile X syndrome


n.
a widespread form of mental retardation caused by a faulty gene on the X chromosome.
[1980–85]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.