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The Adobe Flash Player is required in order to view this content. You can get it here: Down syndromeOne entry found. Main Entry: Down syndrome Function: noun Etymology: J. L. H. Down †1896 English physician Date: 1961 : a congenital condition characterized by moderate to severe mental retardation, slanting eyes, a broad short skull, broad hands with short fingers, and trisomy of the human chromosome numbered 21 —called also Down's syndrome 
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