Source : Webster's Revised Unabridged Dictionary (1913)

Sea scorpion \Sea" scor"pi*on\ (Zo["o]l.)
   (a) A European sculpin ({Cottus scorpius}) having the head
       armed with short spines.
   (b) The scorpene.

Source : WordNet®

sea scorpion
     n : marine fishes having a tapering body with an armored head
         and venomous spines [syn: {scorpionfish}, {scorpion fish}]