The Collaborative International Dictionary of English v.0.48:

Firefish \Fire"fish`\, n. (Zool.)
   A singular marine fish of the genus Pterois, family
   Scorp[ae]nid[ae], of several species, inhabiting the
   Indo-Pacific region. They are usually red, and have very
   large spinose pectoral and dorsal fins.
   [1913 Webster]