English Etymology From vestibule or vestibulum + -o-. Pronunciation (General American) IPA(key): /vɛ.stɪb.jəl.oʊ/ Prefix vestibulo- (anatomy) Of or pertaining to the vestibule. Derived terms English terms prefixed with vestibulo- Translations vestibular Spanish: vestibulo- Spanish Prefix vestibulo- (anatomy) vestibulo Derived terms Spanish terms prefixed with vestibulo-Wikiwand - on Seamless Wikipedia browsing. On steroids.