triple X syndrome
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English
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/44/2-Karyotype-showing-46-XX-and-46-XXX.jpg/220px-2-Karyotype-showing-46-XX-and-46-XXX.jpg)
Noun
[edit]triple X syndrome (uncountable)
- A form of chromosomal variation characterized by the presence of an extra X chromosome in each cell of a human female, sometimes leading to tall stature, learning disabilities, and/or epicanthic folds.