Pronunciation: (in'bôrd", -bōrd"),[key] —adj. 1. located nearer the longitudinal axis or center, as of an airplane: the inboard section of a wing. 2. located inside a hull or aircraft: a motorboat with an inboard engine. 3. (of a motorboat) having the motor inboard.
—adv. inside or toward the longitudinal axis or center of a hull, aircraft, machine, etc. Cf. outboard (def. 4).
—n. 1. an inboard motor.
2. a boat equipped with an inboard motor.