What is the meaning of Adder?

Any snake.

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

  1. A small venomous serpent of the genus Vipera
    1. A common European adder (Vipera berus).
  2. A puff adders, of Africa (genus Bitis).
  3. Any of several small nonvenomous snakes resembling adders
    1. A milk snake (Lampropeltis triangulum).
    2. A hog-nosed snake, of genus Heterodon of harmless colubrid snakes found in North America
  4. Certain venomous snakes resembling other adders
    1. Death adders (Acanthophis spp.), elapid snakes found in Southeast Asia and Australia
    2. A northern copperhead (Agkistrodon contortrix mokasen), 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. A common European adder (Vipera berus).

A common European adder (Vipera berus).

A puff adders, of Africa (genus Bitis).

Any of several small nonvenomous snakes resembling adders

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

A milk snake (Lampropeltis triangulum).

A hog-nosed snake, of genus Heterodon of harmless colubrid snakes found in North America

Certain venomous snakes resembling other adders

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

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

A northern copperhead (Agkistrodon contortrix mokasen), 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