单词	Down syndrome
释义	Down syndrome noun variants or Down's syndrome : a congenital condition characterized especially by developmental delays, usually mild to moderate impairment in cognitive functioning, short stature, upward slanting eyes, a flattened nasal bridge, broad hands with short fingers, decreased muscle tone, and by trisomy of the human chromosome numbered 21 called also trisomy 21 Word History Etymology J. L. H. Down †1896 English physician First Known Use 1961, in the meaning defined above Medical Definition Down syndrome noun variants or Down's syndrome : a congenital condition characterized especially by developmental delays, usually mild to moderate impairment in cognitive functioning, short stature, relatively small head, upward slanting eyes usually with epicanthal folds, flattened nasal bridge, broad hands with short fingers, decreased muscle tone, and by trisomy of the human chromosome numbered 21 called also Down, Down's, trisomy 21
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