—adj.
1 (of a motor) portable and attachable to the outside of the stern of a boat.
2 (of a boat) having an outboard motor.
—adj. & adv. on, towards, or near the outside of esp. a ship, an aircraft, etc.
—n.
1 an outboard engine.
2 a boat with an outboard engine.
Useful english dictionary. 2012.