Source : Webster's Revised Unabridged Dictionary (1913)

Prickleback \Pric"kle*back`\, Pricklefish \Pric"kle*fish`\, n.
   (Zo["o]l.)
   The stickleback.

Source : WordNet®

prickleback
     n 1: small elongate fishes of shallow northern seas; a long
          dorsal fin consists entirely of spines
     2: small (2-4 inches) pugnacious mostly scaleless spiny-backed
        fishes of northern fresh and littoral waters having
        elaborate courtship; subjects of much research [syn: {stickleback}]