The Collaborative International Dictionary of English v.0.48:

lingcod \lingcod\ n.
   1. The flesh of a lean-fleshed fish caught off the U.S.
      Pacific coast. [WordNet sense 1]
      [WordNet 1.5]

   2. A food fish (Ophiodon elongatus) of Northern Pacific
      waters related to greenlings. [WordNet sense 2]

   Syn: Ophiodon elongatus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

lingcod
    n 1: the lean flesh of a fish caught off the Pacific coast of
         the United States
    2: food fish of the northern Pacific related to greenlings [syn:
       lingcod, Ophiodon elongatus]