a chromosomal disorder wherein a female has four X chromosomes instead of the typical couple. Impacted females usually have small physical abnormalities and cognitive retardation; IQ's of impacted people have spanned from 30 to 80 in analyses.

XXXX SYNDROME: "The infant was born with XXXX syndrome and is mentally impaired. "
Cite this page: N., Pam M.S., "XXXX SYNDROME," in, April 29, 2013, (accessed September 20, 2021).