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

 

brainstem

 noun
noun
BrE BrE//ˈbreɪnstem//
 
; NAmE NAmE//ˈbreɪnstem//
 
(anatomy)
 
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the central part of the brain, which continues downwards to form the spinal cord
See the Oxford Advanced American Dictionary entry: brainstem