The Collaborative International Dictionary of English v.0.48:

Coregonidae \Coregonidae\ n.
   a natural family of soft-finned fishes comprising the
   freshwater whitefishes; formerly included in the family
   Salmonidae.

   Syn: family Coregonidae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Coregonidae
    n 1: soft-finned fishes comprising the freshwater whitefishes;
         formerly included in the family Salmonidae [syn:
         Coregonidae, family Coregonidae]