noun
motorized sailboat; auxiliary sailing vessel
A sailing vessel equipped with an auxiliary engine, used when wind is insufficient or for maneuvering in port. Technical nautical term.
この港には古い機帆船が何隻も停泊している。
Several old motorized sailboats are anchored in this port.
機帆船は帆とエンジンの両方で航行できる。
A motorized sailboat can navigate using both sails and an engine.
モーターボート is a small powerboat, typically without sails, unlike 機帆船 which retains sailing capability.
Compound of 機 (engine) + 帆 (sail) + 船 (ship). The term reflects the hybrid nature of the vessel.