clinical manifestation of human males with the karyotype 47,XXY. Underdeveloped secondary sex characteristics, and sterility.

a chromosomal anomaly with chromosome count 47, XXY sex chromosome constitution; also called XXY syndrome

A genetic condition in which a male has extra X chromosomes, thereby causing the development of female secondary sex characteristics. It is widely believed that Joan of Ark was a "Klinefelter male."

syndrome in males that is characterized by small testes and long legs and enlarged breasts and reduced sperm production and mental retardation; a genetic defect in which an extra X chromosome (XXY) is present in the male

In humans, a genetically determined condition in which the individual has two X and one Y chromosome. Affected individuals are male and typically tall and infertile.

A genetic abnormality that is caused by an extra X chromosome in a male, and is typically identified as 47, XXY.

trisomy with a karyotype of 47,XXY -- i.e. a male with an extra X- chromosome. A cause of azoospermia.