Eū-stā'chi-an, a.

(yū-stā'kī-an), a. [N. Lat. tuba Eustachiana (s. Eustachii), so called after the learned Italian physician Eustachi, who died at Rome, 1574.] (Anat.) Discovered by Eustachius.

Eustachian tube (Anat.), a slender pipe affording a passage for the air from a cavity in the ear to the back part of the mouth.—Eustachian valve (Anat.), a semi-lunar, membranous valve in the heart, so called because discovered by Eustachius. Dunglison.