English

Definition of Down’s syndrome noun from the Oxford Advanced Learner's Dictionary

 

Down’s syndrome

 noun
noun
BrE
 
; NAmE
 
(usually North American English Down syndrome) [uncountable]
 
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a medical condition, caused by a fault with one chromosome, in which a person is born with particular physical characteristics and a mental ability that is below average Word Origin 1960s: named after John L. H. Down (1828–96), the English physician who first described it.
See the Oxford Advanced American Dictionary entry: Down’s syndrome