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



BrE BrE//paɪˈniːəl//
; NAmE NAmE//paɪˈniːəl//
(also pineal gland) (anatomy)
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a small organ in the brain that releases a hormone Word Originlate 17th cent.: from French pinéal, from Latin pinea ‘pine cone’. The current anatomical usage refers to the shape of the gland.
See the Oxford Advanced American Dictionary entry: pineal