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thy·mus  audio  (thms) KEY 

NOUN:
pl. thy·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 vestigal thereafter.

ETYMOLOGY:
New Latin, from Greek thumos, warty excrescence, thymus


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