The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

   Note: Larboard is a nearly obsolete term, having been
         superseded by port to avoid liability of confusion
         with starboard, owing to similarity of sound.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Larboard \Lar"board`\, a.
   On or pertaining to the left-hand side of a vessel; port; as,
   the larboard quarter.
   [1913 Webster] Larcener

WordNet (r) 3.0 (2006):

larboard
    adj 1: located on the left side of a ship or aircraft [syn:
           port, larboard]
    n 1: the left side of a ship or aircraft to someone who is
         aboard and facing the bow or nose [syn: larboard, port]
         [ant: starboard]