accumulator register accumulator register /əˈkjʊmjəˌleɪtər ˈrɛdʒɪstər/

noun

1. (computing) a register that has a built-in adder that adds an input number to the contents of the register  ( accumulator , accumulator register )
   (computing) a register that has a built-in adder that adds an input number to the contents of the register