Pronunciation: yü- ' st ā -sh( ē -) ə n- also - ' st ā -k ē - ə n-
Function: noun
Usage: often cap E
Etymology: Bartolommeo Eustachio
Date: 1741
: a bony and cartilaginous tube connecting the middle ear with the nasopharynx and equalizing air pressure on both sides of the tympanic membrane ― called also auditory tube ― see EAR illustration