(electronics) A specific logical circuit that performs an addition operation on two bits.

(rare) Addiction to multiple substances.

A snake of the genus Acanthophis, a group of highly venomous elapids found in Australia and New Guinea. / The copperhead, a venomous pit viper species Agkistrodon contortrix, found in North America.

A species of death adder from Australia, taxonomic name Acanthophis antarcticus, known for its venomosity and speed.

simple past tense and past participle of addend

Furnished with an addendum / (organic chemistry) Furnished with an addend

plural of adder fly

plural of adder's-tongue

greeting / opening or welcoming statement

An address to which mail should be relayed if sent to the wrong address. Chiefly used when a person has moved but some mail continues to arrive at the old address.