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trisomy [trisomies]▼◼◼◼(three copies of a chromosome)noun[UK: trˈaɪsəmi] [US: trˈaɪsəmi]
trisomy 21▼◼◼◼(syndrome)noun
Down syndrome▼◼◼◻(genetic disorder caused by a chromosomal excess)proper noun[UK: daʊn ˈsɪn.drəʊm] [US: ˈdaʊn ˈsɪndroʊm]
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