Source : Webster's Revised Unabridged Dictionary (1913)

Scad \Scad\, n. [Gael. & Ir. sgadan a herring.] (Zo["o]l.)
   (a) A small carangoid fish ({Trachurus saurus}) abundant on
       the European coast, and less common on the American. The
       name is applied also to several allied species.
   (b) The goggler; -- called also {big-eyed scad}. See
       {Goggler}.
   (c) The friar skate. [Scot.]
   (d) The cigar fish, or round robin.

Source : WordNet®

scad
     n : any of a number of fishes of the family Carangidae