Definition of thymus noun from the Oxford Advanced Learner's Dictionary

 

thymus

 noun
noun
BrE BrE//ˈθaɪməs//
 
; NAmE NAmE//ˈθaɪməs//
 
(also thymus gland)(anatomy)
 
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an organ in the neck that produces lymphocytes (= cells to fight infection) Word Origin late 16th cent. (denoting a growth or tumour resembling a bud): from Greek thumos ‘excrescence like a thyme bud, thymus gland’.
See the Oxford Advanced American Dictionary entry: thymus