accumulator Definition

1. elec engineering.
A storage battery that can be recharged by passing a current through it from an external direct current supply.
(Brit)
2. horse-racing.
A bet on four or more races, where the original money bet and any money won are bet on the next race, so that the better either wins a lot of money or loses it all.
Form: accumulator bet (also)
3. computing.
A part of the memory of a computer that is used as a temporary store for the results of an arithmetical calculation or logic operation.