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thy·mus (thī'məs)
n., pl., -mus·es.
A small glandular organ that is situated behind the top of the breastbone, consisting mainly of lymphatic tissue and serving as the site of T cell differentiation. The thymus increases gradually in size and activity until puberty, becoming vestigial thereafter.

[New Latin, from Greek thumos, warty excrescence, thymus.]




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