the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. A boat of a peculiarly strong and buoyant type, capable of passing safely through surf.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a boat that can be launched or landed in heavy surf
Word Usage
"The 'surfboat' was about a quarter of a mile offshore 125 miles north of Sydney when the crew, most of who have been volunteer surf lifesavers for just a few months, encountered the shark."