eustachian tube Eustachian • eustachio · · · Info · Definitions · Characters · · eustachian tube · · Text Common · · Latin · · Scripts 15 · · Length 6 · · Syllables Definitions · · · (noun) either of the paired tubes connecting the middle ears to the nasopharynx; equalizes air pressure on the two sides of the eardrum. Synonyms: Eustachian tube, auditory tube. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075