ˌantɪdɪˈluːvɪəl ˌantɪdɪˈluːvɪən ˌantɪdɪˈluːvɪən ˈæntɪˌkweɪtɪd ɑː.ˈkeɪ.ɪk ɑɹ.ˈkeɪ.ɪk so extremely old as seeming to belong to an earlier period a ramshackle antediluvian tenement antediluvian ideas archaic laws of or relating to the period before the biblical flood antediluvian man a very old person any of the early patriarchs who lived prior to the Noachian deluge