Meaning of ADDER in English

noun a serpent.

2. adder ·noun ·same·as sea adder.

3. adder ·noun one who, or that which, adds; ·esp., a machine for adding numbers.

4. adder ·noun in america, the term is commonly applied to several harmless snakes, as the milk adder, puffing adder, ·etc.

5. adder ·noun a small venomous serpent of the genus vipera. the common european adder is the vipera (/ pelias) berus. the puff adders of africa are species of clotho.

Webster English vocab.      Английский словарь Webster.