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

 

thyroid

 noun
noun
BrE BrE//ˈθaɪrɔɪd//
 
; NAmE NAmE//ˈθaɪrɔɪd//
 
(also thyroid gland)(anatomy)
 
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a small organ at the front of the neck that produces hormones that control the way in which the body grows and functions an underactive/overactive thyroid Word Origin early 18th cent. (as an adjective): from Greek (khondros) thureoeidēs ‘shield-shaped (cartilage)’, from thureos ‘oblong shield’.
See the Oxford Advanced American Dictionary entry: thyroid