Wordnet 3.0
NOUN (1)
1. 
 bottom-dweller of warm western Atlantic coastal waters having a flattened scaleless body that crawls about on fleshy pectoral and pelvic fins; 
The Collaborative International Dictionary of English v.0.48:
Batfish \Bat"fish`\, n. (Zool.)
   A name given to several species of fishes:
   (a) The Malthe vespertilio of the Atlantic coast.
   (b) The flying gurnard of the Atlantic (Cephalacanthus
       spinarella).
   (c) The California batfish or sting ray (Myliobatis
       Californicus.)
       [1913 Webster]
WordNet (r) 3.0 (2006):
batfish
    n 1: bottom-dweller of warm western Atlantic coastal waters
         having a flattened scaleless body that crawls about on
         fleshy pectoral and pelvic fins