Wordnet 3.0
NOUN (1)
1. 
 eels that live in fresh water as adults but return to the sea to spawn; 
[syn: Anguillidae, family Anguillidae]
The Collaborative International Dictionary of English v.0.48:
Anguillidae \Anguillidae\ n.
   a natural family of eels that live in fresh water as adults
   but return to the sea to spawn.
   Syn: family Anguillidae.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
Anguillidae
    n 1: eels that live in fresh water as adults but return to the
         sea to spawn [syn: Anguillidae, family Anguillidae]