The Collaborative International Dictionary
Flyboat \Fly"boat`\, n. [Fly + boat: cf. D. vlieboot.]
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(Naut.) A large Dutch coasting vessel.
Captain George Weymouth made a voyage of discovery to the northwest with two flyboats.
--Purchas. A kind of passenger boat formerly used on canals.
Wiktionary
n. 1 A large Dutch coasting vessel. 2 A kind of passenger boat formerly used on canals.
Wikipedia
The flyboat (also spelled fly-boat or fly boat) was a European light vessel (developed primarily as a mercantile cargo carrier, although many served as warships in an auxiliary role) of between 70 and 200 tons, used in the late 16th and early 17th century; the name was subsequently applied to a number of disparate vessels which achieved high speeds or endurance.
Usage examples of "flyboat".
It was in the Flyboat, a tavern off the Warmoesstraat, close enough to the Exchange that merchants regarded it as adjunct, a place to continue business when the gates of the bourse closed.
Then John Clarke of the high-sterned Roebuck, a square-rigged flyboat of Dutch design.
Oh, sure, we could probably see off a squadron of the flyboats the Commonwealth navy uses, but not real ships.