antediluvian
adjective
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so extremely old as seeming to belong to an earlier period“a ramshackle antediluvian tenement”archaic
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of or relating to the period before the biblical flood“antediluvian man”antediluvial
noun
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a very old personancient
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any of the early patriarchs who lived prior to the Noachian delugeantediluvian patriarch