The Collaborative International Dictionary
Weever \Wee"ver\, n. [Probably from F. vive, OF. vivre, a kind of fish, L. vipera viper. Cf. Viper.] (Zo["o]l.) Any one of several species of edible marine fishes belonging to the genus Trachinus, of the family Trachinid[ae]. 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).
Wiktionary
n. The European greater weeverfish (''Trachinus draco''), capable of inflicting severe wounds with the spinous rays of its dorsal fin.