The Collaborative International Dictionary of English v.0.48:
Weever \Wee"ver\, n. [Probably from F. vive, OF. vivre, a kind
of fish, L. vipera viper. Cf. Viper.] (Zool.)
Any one of several species of edible marine fishes belonging
to the genus Trachinus, of the family Trachinidae. They
have a broad spinose head, with the eyes looking upward. The
long dorsal fin is supported by numerous strong, sharp spines
which cause painful wounds.
Note: The two British species are the great, or greater,
weever (Trachinus draco), which becomes a foot long
(called also gowdie, sea cat, stingbull, and
weaverfish), and the lesser weever (Trachinus
vipera), about half as large (called also otter
pike, and stingfish).