In"board` (?), a. & adv. 1. Naut. Inside the line of a vessel's bulwarks or hull; the opposite of outboard; as, an inboard cargo; haul the boom inboard.
2. Mech. From without inward; toward the inside; as, the inboard stroke of a steam engine piston, the inward or return stroke.
© Webster 1913. | 
