either of two small, European, marine fishes of the genus Trachinus, T. draco(greater weever) or T. vipera(lesser weever), having highly poisonous dorsal spines.
2.
any fish of the same family, Trachinidae.
Origin: 1615–25; perh. continuing ME *wever, OE wifer arrow (c. ON vifr sword); modern meaning by assoc. with obs. wiver viper; see wyvern