Dictionary definition · antediluvian
noun
- any of the early patriarchs who lived prior to the Noachian deluge
- a very old person
adjective
- of or relating to the period before the biblical flood"antediluvian man"
- so extremely old as seeming to belong to an earlier period"a ramshackle antediluvian tenement"
Source: Open English WordNet (CC BY 4.0).