Pronunciation

• (US) IPA ^(key): /ˈædɚ/Category:Entries with IPA pronunciation

• Audio (AU)

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Noun

1. (countable)Category:Countable nouns An adder is a short, rather massive poisonous snake with long front teeth that poison its victims by biting them.
   • Synonym: viper

   Don't walk in the bush unprotected, you may be bitten by an adder!

2. Adder can also stand for any poisonous snake.

   Certain poisonous snakes in North America are called adders though they are not true adders.

3. Someone or something that adds. Usually a part (circuit) of computer chip.

   The CPU contained extra adders to increase speed.