Source : Webster's Revised Unabridged Dictionary (1913)

Surfboat \Surf"boat`\, n. (Naut.)
   A boat intended for use in heavy surf. It is built with a
   pronounced sheer, and with a view to resist the shock of
   waves and of contact with the beach.

Source : WordNet®

surfboat
     n : a boat that can be launched or landed in heavy surf