Definitions from Wiktionary (ADDer)

▸ noun:  (obsolete) Any snake.
▸ noun:  A name loosely applied to various snakes more or less resembling the viper.
▸ noun:  (chiefly British) A small venomous serpent of the genus Vipera
▸ noun:  The common European adder (Vipera berus).
▸ noun:  The puff adders, of Africa (genus Bitis).
▸ noun:  (US, Canada) Any of several small nonvenomous snakes resembling adders
▸ noun:  Lampropeltis triangulum (milk snake).
▸ noun:  Heterodon spp. (hog-nosed snakes), a genus of harmless colubrid snakes found in North America
▸ noun:  Certain venomous snakes resembling other adders
▸ noun:  Acanthophis spp. (death adders), elapid snakes found in Southeast Asia and Australia
▸ noun:  Agkistrodon contortrix mokasen, the northern copperhead, a venomous viper found in the eastern United States
▸ noun:  A sea stickleback or adder fish (Spinachia spinachia).
▸ noun:  Someone who or something which performs arithmetic addition; a machine for adding numbers.
▸ noun:  An electronic device that adds voltages, currents or frequencies.
▸ noun:  Something which adds or increases.
▸ noun:  (informal) A person who has attention deficit disorder.
▸ Also see adder

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