The Collaborative International Dictionary of English v.0.48:

Echeneididae \Echeneididae\ n.
   a natural family of fishes having a sucking disk on the head
   for clinging to other fishes and to ships.

   Syn: family Echeneididae, family Echeneidae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Echeneididae
    n 1: fishes having a sucking disk on the head for clinging to
         other fishes and to ships [syn: Echeneididae, family
         Echeneididae, family Echeneidae]