the left side of a ship or aircraft to someone who is aboard and facing the bow or nose
<noun.artifact> [ adj ]
located on the left side of a ship or aircraft
<adj.all>
Larboard \Lar"board`\, a. On or pertaining to the left-hand side of a vessel; port; as, the larboard quarter.
Larboard \Lar"board`\, n. [Lar- is of uncertain origin, possibly the same as lower, i. e., humbler in rank, because the starboard side is considered by mariners as higher in rank; cf. D. laag low, akin to E. low. See {Board}, n., 8.] (Naut.) The left-hand side of a ship to one on board facing toward the bow; port; -- opposed to {starboard}.
Note: Larboard is a nearly obsolete term, having been superseded by {port} to avoid liability of confusion with starboard, owing to similarity of sound.