flyboat
A large flat-bottomed coasting vessel, formerly found in Holland, Spain and Portugal.
historical
a ship of Bristol was chased into this harbour by two Spanish fly-boats, and they report […] that there are five men of war, Spanish, in the road of Conquet
August 14, 1595, Thomas Treffry, letter to Sir Robert CecilA kind of (often horse-drawn) passenger boat formerly used on canals. Faster than other types of canal boats at the time, the horses would run along the towpath
historical
Where it comes from
Borrowed from Dutch vlieboot, but re-analysed as fly + boat.
Adapted from the Wiktionary entry flyboat (CC BY-SA 4.0).