French Etymology From vestibule + -aire. Pronunciation IPA(key): /vɛs.ti.by.lɛʁ/ Audio:(file) Adjective vestibulaire (plural vestibulaires) vestibular Further reading “vestibulaire”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.Wikiwand - on Seamless Wikipedia browsing. On steroids.