The Collaborative International Dictionary of English v.0.48:

Tilefish \Tile"fish`\, n. (Zool.)
   A large, edible, deep-water food fish (Lopholatilus
   chamaeleonticeps) more or less thickly covered with large,
   round, yellow spots.
   [1913 Webster]

   Note: It was discovered off the Eastern coast of the United
         States in 1880, and was abundant in 1881, but is
         believed to have become extinct in 1882.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Lopholatilus chamaeleonticeps
    n 1: yellow-spotted violet food fish of warm deep waters [syn:
         tilefish, Lopholatilus chamaeleonticeps]