/in"bawrd', -bohrd'/ , 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.
4. inside or toward the longitudinal axis or center of a hull, aircraft, machine, etc. Cf. outboard (def. 4).
n.
5. an inboard motor.
6. a boat equipped with an inboard motor.
[ 1840-50; orig. phrase in board ]