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Definition of Thymus

Thymus: An organ that is located in the upper chest behind the breastbone and in front of the lower neck in which the immune cells called T lymphocytes mature and multiply in early life. The thymus begins to shrink after puberty.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=5775
Last Editorial Review: 3/19/2012

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