Definition of Klinefelter's syndrome
: an abnormal condition in a male characterized by usually two X and one Y chromosomes, infertility, smallness of the testicles, sparse facial and body hair, and enlarged breasts
— called also Klinefelter syndrome
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Merriam-Webster unabridged
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Time Traveler for Klinefelter's syndrome
The first known use of Klinefelter's syndrome was in 1950
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