The Collaborative International Dictionary of English v.0.48:
Tragus \Tra"gus\, n. [NL., fr. Gr. ? a part of the inner ear.] (Anat.) The prominence in front of the external opening of the ear. See Illust. under Ear. [1913 Webster]WordNet (r) 3.0 (2006):
tragus n 1: a small cartilaginous flap in front of the external opening of the ear