noun
a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
• Syn: ↑mongolism, ↑mongolianism, ↑Down's syndrome, ↑trisomy 21
• Hypernyms: ↑trisomy, ↑birth defect, ↑congenital anomaly, ↑congenital defect, ↑congenital disorder, ↑congenital abnormality
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/ˈdaʊn-/ noun [noncount]
medical : a condition that someone is born with and that causes below average mental abilities and problems in physical development. — called also Down's, Down's syndrome
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Useful english dictionary. 2012.