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