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

 

epiglottis

 noun
noun
BrE BrE//ˌepɪˈɡlɒtɪs//
 
; NAmE NAmE//ˌepɪˈɡlɑːtɪs//
 
(anatomy)
 
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a thin piece of tissue behind the tongue that prevents food or drink from entering the lungs Word Origin late Middle English: from Greek epiglōttis, from epi ‘upon, near to’ + glōtta ‘tongue’.
See the Oxford Advanced American Dictionary entry: epiglottis