trisomy 21

Noun

1.

trisomy 21 - a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation Synonyms: Down syndrome, Down's syndrome, mongolianism, mongolism

backwardness, birth defect, congenital abnormality, congenital anomaly, congenital defect, congenital disorder, Down syndrome, Down's syndrome, mental retardation, mongolianism, mongolism, retardation, slowness, subnormality, trisomy