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Pertaining to the Eustachian tube; as, Eustachian catheter. Eustachian catheter, a tubular instrument to be introduced into the Eustachian tube so as to allow of inflation of the middle ear through the nose or mouth. -- Eustrachian tube (Anat.), a passage from the tympanum of the ear to the pharynx. See Ear. -- Eusta…

r instrument to be introduced into the bladder through the urethra to draw off the urine. Eustachian catheter. See under Eustachian. -- Prostatic catheter, one adapted for passing an enlarged prostate.

The Eustachian tube, or the Fallopian tube.

omy to indicate connection with, or relation to, the tympanum; as in tympanohyal, tympano-Eustachian.