any of the early patriarchs who lived prior to the Noachian deluge
a very old person
of or relating to the period before the biblical flood;
so extremely old as seeming to belong to an earlier period;
"a ramshackle antediluvian tenement"
- His ideas are positively antediluvian!
- For love? What antediluvian notions you have! Can one talk of love in these days?
- She was more than old-fashioned, she was an antediluvian.