Source : Webster's Revised Unabridged Dictionary (1913)

Shipboard \Ship"board`\, n. [Ship + board. See {Board}, n., 8]
   A ship's side; hence, by extension, a ship; -- found chiefly
   in adverbial phrases; as, on shipboard; a shipboard.

Source : WordNet®

shipboard
     adj : taking place or existing on board a ship; "a shipboard
           fire"; "shipboard romances"