A congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation.  Synonyms: Down's syndrome, Down syndrome, mongolianism, mongolism.
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| Words linked to "Trisomy 21" :   congenital disorder, congenital abnormality, congenital defect, congenital anomaly, trisomy, birth defect | 
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