Within the hull or interior of a ship or boat; also, in the middle part of the hold of a ship: as, stow the freight well inboard.Within the rail or bulwarks; toward or nearer to the center: as, to draw the sail inboard.In the interior of a ship or boat; being within the hull or hold: as, inboard cargo: opposed to outboard.Not projecting over the rail or bulwarks: as, an inboard spar or sail.In mech., toward the inside; toward the main center or center-line: as, an inboard stroke of the piston; an inboard bearing.