Source : Webster's Revised Unabridged Dictionary (1913)

Seaboat \Sea"boat`\ [AS. s[=ae]b[=a]t.]
   1. A boat or vessel adapted to the open sea; hence, a vessel
      considered with reference to her power of resisting a
      storm, or maintaining herself in a heavy sea; as, a good
      sea boat.

   2. (Zo["o]l.) A chitin.