Source : Webster's Revised Unabridged Dictionary (1913)

Postdiluvial \Post`di*lu"vi*al\, Postdiluvian
\Post`di*lu"vi*an\, a. [Pref. post- + diluvial, diluvian.]
   Being or happening after the flood in Noah's days.

Postdiluvian \Post`di*lu"vi*an\, n.
   One who lived after the flood.