Klinefelter syndrome (ər) or Klinefelter`s syndrome, also known as 47,XXY or XXY, is the set of symptoms resulting from a genetic disorder in which there is at least one extra X chromosome to a standard human male karyotype or an additional Y chromosome to a standard human female, for a total of 47 chromosomes rather than the 46 found in genetic....
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http://en.wikipedia.org/wiki/Klinefelter_syndrome
A genetic disorder in males caused by having one or more extra X chromosomes. Males with this disorder may have larger than normal breasts, a lack of facial and body hair, a rounded body type, and small testicles. They may learn to speak much later than other children and may have difficulty learning to read and write. Klinefelter syndrome increase...
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http://www.cancer.gov/dictionary?expand=K
<syndrome> A genetic syndrome observed in many mammals caused by the presence of an extra X chromosome in the male karyotype. ... The normal male is XY but in this disorder the chromosomal abnormality is XXY, and affects only males. Infertility is common. In humans, the infant appears normal at birth, but the defect usually becomes apparent i...
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http://www.encyclo.co.uk/local/20973
(klīn´fel-tәr) a condition in males characterized by small testes, with fibrosis and hyalinization of seminiferous tubules, impairment of function and clumping of Leydig cells, and an increase in urinary gonadotropins. It is associated with an abnormality of the sex chromosomes, typically an XXY chromosome co...
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http://www.encyclo.co.uk/local/21001
An endocrine condition caused by a an extra x-chromosome (47,xxy)
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http://www.encyclo.co.uk/local/22391
Type: Term Pronunciation: klīn′fel-tĕr Definitions: 1. a chromosomal anomaly with chromosome count 47, XXY sex chromosome constitution; buccal and other cells are usually sex chromatin positive; patients are male in development but have seminiferous tubule dysgenesis resulting in azospenmia and infertility, elevated plasma and urina...
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http://www.medilexicon.com/medicaldictionary.php?t=88434
Our Klinefelter syndrome Main Article provides a comprehensive look at the who, what, when and how of Klinefelter syndrome Klinefelter syndrome: A chromosome condition in boys and men that is usually due to 47 chromosomes with XXY sex chromosomes. XXY is one of the most common chromosomal abnormalities. It occurs in 1 in 500 male births. Because it...
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http://www.medterms.com/script/main/art.asp?articlekey=4111
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