the GNU version of the Collaborative International Dictionary of English
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.
A chiton.
The Century Dictionary and Cyclopedia
n. A vessel considered with reference to her sea-going qualities or behavior at sea: as, a good or a bad sea-boat.
n. A sea-bug.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a boat that is seaworthy; that is adapted to the open seas
Word Usage
"She was said to be a sturdy seaboat, and was well equipped by the merchants of Honfleur."