[in.board] adv (1830) 1: inside the line of a ship's bulwarks or hull
2: toward the center line of a vehicle or craft (as a ship or aircraft)
[2]inboard adj (1847) 1: located inboard "an ~ engine" "an ~ spoiler"
2. of a boat: having an inboard engine [3]inboard n (1950): a boat with an inboard motor