What is the meaning of Adder?

Any snake.

A name loosely applied to various snakes more or less resembling the viper.

  1. A small venomous serpent of the genus Vipera
    1. The common European adder (Vipera berus).
  2. The puff adders, of Africa (genus Bitis).
  3. Any of several small nonvenomous snakes resembling adders
    1. Lampropeltis triangulum (milk snake).
    2. Heterodon spp. (hog-nosed snakes), a genus of harmless colubrid snakes found in North America
  4. Certain venomous snakes resembling other adders
    1. Acanthophis spp. (death adders), elapid snakes found in Southeast Asia and Australia
    2. Agkistrodon contortrix mokasen, the northern copperhead, a venomous viper found in the eastern United States
  5. A sea stickleback or adder fish (Spinachia spinachia).

A small venomous serpent of the genus Vipera

  1. The common European adder (Vipera berus).

The common European adder (Vipera berus).

The puff adders, of Africa (genus Bitis).

Any of several small nonvenomous snakes resembling adders

  1. Lampropeltis triangulum (milk snake).
  2. Heterodon spp. (hog-nosed snakes), a genus of harmless colubrid snakes found in North America

Lampropeltis triangulum (milk snake).

Heterodon spp. (hog-nosed snakes), a genus of harmless colubrid snakes found in North America

Certain venomous snakes resembling other adders

  1. Acanthophis spp. (death adders), elapid snakes found in Southeast Asia and Australia
  2. Agkistrodon contortrix mokasen, the northern copperhead, a venomous viper found in the eastern United States

Acanthophis spp. (death adders), elapid snakes found in Southeast Asia and Australia

Agkistrodon contortrix mokasen, the northern copperhead, a venomous viper found in the eastern United States

A sea stickleback or adder fish (Spinachia spinachia).

Someone who or something which performs arithmetic addition; a machine for adding numbers.

An electronic device that adds voltages, currents or frequencies.

Something which adds or increases.

viper, adder

viper, adder; snake of the family Viperidae

common viper, Vipera berus

imperative of addere

or

but, however

only, but

Source: wiktionary.org