Eustachian is an anatomical adjective/noun relating to the auditory tube (Eustachian tube) that connects the middle ear to the nasopharynx. In medical contexts it describes structures, functions, or conditions of the tube, and in common usage it appears in phrases like Eustachian tube dysfunction. The term is used mainly in clinical language and anatomy discussions. It’s pronounced with three syllables and a stress on the second: eu-STAH-kee-ən.
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