boat: [OE] In origin, the word boat seems to be restricted to northern parts of Europe: Old English bāt and Old Norse beit are the only early examples (German boot was borrowed from them, and French bateau comes from the English word). They point to a common Germanic origin in *bait-. It has been speculated that this may be related to bitt ‘post for fastening ship’s cables’. If true, this could mean that boat originally referred to one or other of the structural members of a wooden vessel. [boat etymology, boat origin, 英语词源]