adder¹ /adˈər/

The only venomous snake found in Britain, a viper

addˈerstone noun

A prehistoric spindle-whorl or bead, popularly attributed to the agency of adders

adˈder's-tongue noun

1. A genus (Ophioglossum) of ferns whose spore cases grow on a spike resembling a snake's tongue
2. Dog's-tooth violet (N American)

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