Billfish \Bill"fish`\ (b[i^]l"f[i^]sh`), n. (Zool.)
A name applied to several distinct fishes:
(a) The garfish ({Tylosurus longirostris}, 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}).
[1913 Webster]