The Collaborative International Dictionary of English v.0.48:
Ferryboat \Fer"ry*boat`\, n. A vessel for conveying passengers, merchandise, etc., usually across streams, rivers, bays, and other narrow waters. Syn: ferry[2]. [1913 Webster]WordNet (r) 3.0 (2006):
ferryboat n 1: a boat that transports people or vehicles across a body of water and operates on a regular schedule [syn: ferry, ferryboat]