Definition of billfish:
(n) :
Any of several fish, of the families Istiophoridae and Xiphiidae, that have an elongated jaw.
(n) :
Other fish with elongated jaws:
(n) :
gars (Lepisosteidae spp.)
(n) :
sauries (Scomberesocidae spp.)
(n) :
silver gar (Strongylura maritima, in family Belonidae)
(n) :
northern pipefish (Syngnathus fuscus, in family Syngnathidae)