Source : Webster's Revised Unabridged Dictionary (1913)

Antediluvial \An`te*di*lu"vi*al\, a. [Pref. ante- + diluvial.]
   Before the flood, or Deluge, in Noah's time.

Source : WordNet®

antediluvial
     adj : of or relating to the period before the Biblical flood;
           "Antediluvian man" [syn: {antediluvian}]