- an abnormal condition in which at least one extra X chromosome is present in a male: characterized by reduced or absent sperm production, small testicles, and in some cases enlarged breasts.
Origin of Klinefelter's syndrome
named after Harry Fitch Klinefelter (born 1912), U.S. physician, co-author of a description of the syndrome
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- A chromosomal anomaly in males characterized by the presence of two X-chromosomes and one Y-chromosome, causing reduced testicular size, seminiferous tubule dysgenesis, and infertility.XXY syndrome
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.