Source : Webster's Revised Unabridged Dictionary (1913)

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         superseded by port to avoid liability of confusion with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.

Larboard \Lar"board`\, a.
   On or pertaining to the left-hand side of a vessel; port; as,
   the larboard quarter.

Source : WordNet®

larboard
     adj : located on the left side of a ship or aircraft [syn: {port}]
     n : the left side of a ship or aircraft to someone facing the
         bow or nose [syn: {port}] [ant: {starboard}]