Source : Webster's Revised Unabridged Dictionary (1913)

Flyboat \Fly"boat`\, n. [Fly + boat: cf. D. vlieboot.]
   1. (Naut.) A large Dutch coasting vessel.

            Captain George Weymouth made a voyage of discovery
            to the northwest with two flyboats.   --Purchas.

   2. A kind of passenger boat formerly used on canals.