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Variant of Down syndrome.
a. a condition caused by the presence of an extra copy of chromosome 21 resulting in learning difficulties and physical differences, such as shorter stature. Former name (offensive): mongolism Technical name: trisomy 21
b. (as modifier): a Down's syndrome baby.
[C19: after John Langdon-Down (1828–96), English physician]
Usage: Although the condition was once generally known as mongolism, this term has been considered offensive since the early 1960s. The terms Down's syndrome or (US) Down syndrome are now preferred.
mongolism.See also: Disease and Illness
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|Noun||1.||Down's syndrome - 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