Definition of pineal noun from the Oxford Advanced American Dictionary

 

pineal

 noun
noun
NAmE//ˈpaɪniəl//
 
, NAmE//paɪˈniəl//
 
, NAmE//ˈpɪniəl//
 
(also ˈpineal ˌgland)(anatomy)
 
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a small organ in the brain that releases a hormone
See the Oxford Advanced Learner's Dictionary entry: pineal