Source : Webster's Revised Unabridged Dictionary (1913)

Megalops \Meg"a*lops\, n. [NL., fr. Gr. me`gas, -a`loy, large +
   'w`ps eye.] (Zo["o]l.)
   1. A larva, in a stage following the zo["e]a, in the
      development of most crabs. In this stage the legs and
      abdominal appendages have appeared, the abdomen is
      relatively long, and the eyes are large. Also used
      adjectively.

   2. A large fish; the tarpum.