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• n  (genetics) abnormal complement of sex hormones in a male resulting in Klinefelter's syndrome

• A fairly common case of "one chromosome too many" is an xxy combination, but this is accompanied by external male genitalia and poor, nonathletic physical development.

• XXY

News & Articles

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• XXY Brain Trust Breaks New Ground to Support Intersex 47,XXYs (Klinefelter Syndrome) and Variants Worldwide
  The guiding founding principles of the XXY Brain Trust: 47,XXYs are all genders, not just male; the most important aspect of life for 47,XXYs (Klinefelter Syndrome) is appropriate medical care for individuals who express themselves in a range of gender from female to male. Don't try to fix XXYs or variants with hormones or surgical intervention; wait until they are old enough to make their own ...
  Aug. 7, 2013 - PRWeb