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|Noun||1.||mongolianism - a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation|
birth defect, congenital abnormality, congenital anomaly, congenital defect, congenital disorder - a defect that is present at birth
trisomy - chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell
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