BILLFISH

needlefish, gar, billfish

(noun) elongate European surface-dwelling predacious fishes with long toothed jaws; abundant in coastal waters

saury, billfish, Scomberesox saurus

(noun) slender long-beaked fish of temperate Atlantic waters

billfish

(noun) giant warm-water game fish having a prolonged and rounded toothless upper jaw

gar, garfish, garpike, billfish, Lepisosteus osseus

(noun) primitive predaceous North American fish covered with hard scales and having long jaws with needlelike teeth

Source: WordNet® 3.1

Etymology

Noun

billfish (plural billfishes or billfish)

Any of several fish, of the families Istiophoridae and Xiphiidae, that have an elongated jaw.

Other fish with elongated jaws

gars (Lepisosteidae)

saury (Scomberesocidae)

silver gar (Strongylura maritima, Belonidae)

northern pipefish (Syngnathus fuscus, Syngnathidae)

Source: Wiktionary

Bill"fish`, n. (Zoöl.)

Definition: A name applied to several distinct fishes: (a) The garfish (Tylosurus, or Belone, longirostris) and allied species. (b) The saury, a slender fish of the Atlantic coast (Scomberesox saurus). (c) The Tetrapturus albidus, a large oceanic species related to the swordfish; the spearfish. (d) The American fresh-water garpike (Lepidosteus osseus).

Source: Webster’s Unabridged Dictionary 1913 Edition