adderbolt

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• adder — (n.) O.E. næddre a snake, serpent, viper, from W.Gmc. *nædro a snake (Cf. O.N. naðra, M.Du. nadre, O.H.G. natra, Ger. Natter, Goth. nadrs), from PIE root *netr (Cf. L. natrix water snake, probably by folk association with nare …   Etymology dictionary