Definitions

1. adjective

relating to the Eustachian tube, which connects the middle ear to the back of the throat, or a valve or tube in the body that performs a similar function

“The doctor explained the eustachian tube’s role in equalizing air pressure in the ears.”

2. noun

a valve or tube in the body that connects the middle ear to the back of the throat

“The patient’s eustachian tube was inflamed due to the illness.”