"antediluvian" in the noun sense
1. antediluvian, antediluvian patriarch
any of the early patriarchs who lived prior to the Noachian deluge
2. ancient, antediluvian
a very old person
"antediluvian" in the adjective sense
1. antediluvian, antediluvial
of or relating to the period before the biblical flood
"antediluvian man"
2. antediluvian, antiquated, archaic
so extremely old as seeming to belong to an earlier period
"a ramshackle antediluvian tenement"
"antediluvian ideas"
"archaic laws"
Source: WordNet® (An amazing lexical database of English)
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