A small venomous serpent of the genus Vipera
Agkistrodon contortrix mokasen, the northern copperhead, a venomous viper found in the eastern United States
Lampropeltis triangulum (milk snake).
The puff adders, of Africa (genus Bitis).
Heterodon spp. (hog-nosed snakes), a genus of harmless colubrid snakes found in North America
The common European adder (Vipera berus).
Someone who or something which performs arithmetic addition; a machine for adding numbers.
Acanthophis spp. (death adders), elapid snakes found in Southeast Asia and Australia
A sea stickleback or adder fish (Spinachia spinachia).
An electronic device that adds voltages, currents or frequencies.
Something which adds or increases.
A wingless serpentine dragon having two arms.
A draconic creature, similar to a wyvern.