From The Collaborative International Dictionary of English v.0.48:

Inboard \In"board`\, a. & adv.
   1. (Naut.) 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.
      [1913 Webster]

   2. (Mech.) From without inward; toward the inside; as, the
      inboard stroke of a steam engine piston, the inward or
      return stroke.
      [1913 Webster]
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