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Definition of Down syndrome noun from the Oxford Advanced American Dictionary

 

Down syndrome

 noun
noun
NAmE//ˈdaʊn ˌsɪndroʊm//
 
(also Down's 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
See the Oxford Advanced Learner's Dictionary entry: Down syndrome

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