'Inboard' definitions:

Definition of 'inboard'

From: WordNet
adjective
Located within the hull or nearest the midline of a vessel or aircraft; "the inboard flaps on the wing" [ant: outboard]

Definition of 'Inboard'

From: GCIDE
  • 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]