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

Down syndrome

noun
 
/ˈdaʊn sɪndrəʊm/
 
/ˈdaʊn sɪndrəʊm/
(North American English)
(also Down's syndrome especially in British English)
[uncountable]
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  1. a medical condition that some people are born with, caused by a fault with one chromosome, which results in learning disabilitiesTopics Disabilityc2
See Down syndrome in the Oxford Advanced American Dictionary

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