accumulator

One who, or that which, accumulates.
(British) A wet-cell storage battery.
A collective bet on successive events, with both stake and winnings being carried forward to accumulate progressively.
A system of elastic springs for relieving the strain upon a rope, as in deep-sea dredging.
A vessel containing pressurized hot water ready for release as steam.
A container which stores hydraulic power for release, in the form of a pressurized fluid (often suspended within a larger tank of fluid under pressure).
A register or variable used for holding the intermediate results of a computation or data transfer.
A derivative contract under which the seller commits to sell shares of an underlying security at a certain strike price, which the buyer is obligated to buy.
(UK, historical) One who takes two higher degrees simultaneously, to reduce their length of study.
A one way membership function.