Source : Webster's Revised Unabridged Dictionary (1913)

Epiglottis \Ep`i*glot"tis\, n. [NL., fr. Gr. ?; 'epi` upon + ?,
   ?, tongue. See {Glottis}.] (Anat.)
   A cartilaginous lidlike appendage which closes the glottis
   while food or drink is passing while food or drink is passing
   through the pharynx.

Source : WordNet®

epiglottis
     n : a flap of cartilage that covers the windpipe while
         swallowing
     [also: {epiglottides} (pl)]