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A detachable engine mounted on outboard brackets or on the stern of a boat.
a portable gasoline engine with propeller and tiller, clamped on the stern of a boat.
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|Noun||1.||outboard motor - internal-combustion engine that mounts at stern of small boat|
internal-combustion engine, ICE - a heat engine in which combustion occurs inside the engine rather than in a separate furnace; heat expands a gas that either moves a piston or turns a gas turbine