Source : Webster's Revised Unabridged Dictionary (1913)

Antediluvian \An`te*di*lu"vi*an\, a.
   Of or relating to the period before the Deluge in Noah's
   time; hence, antiquated; as, an antediluvian vehicle. -- n.
   One who lived before the Deluge.

Source : WordNet®

antediluvian
     adj 1: of or relating to the period before the Biblical flood;
            "Antediluvian man" [syn: {antediluvial}]
     2: so extremely old as seeming to belong to an earlier period;
        "a ramshackle antediluvian tenement"; "antediluvian
        ideas"; "archaic laws" [syn: {antiquated}, {archaic}]
     n 1: any of the early patriarchs who lived prior to the Deluge
          [syn: {antediluvian patriarch}]
     2: a very old (or old fashioned) person