noun

• (literal) One who, or that which, accumulates.
• (Britain) A wet-cell storage battery.
• (gambling) A collective bet on successive events, with both stake and winnings being carried forward to accumulate progressively.
• (mechanics) A system of elastic springs for relieving the strain upon a rope, as in deep-sea dredging.
• (manufacturing) A vessel containing pressurized hot water ready for release as steam.
• (engineering, hydraulics) 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).
• (programming) A register or variable used for holding the intermediate results of a computation or data transfer.
• (finance) 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, education, historical) One who takes two higher degrees simultaneously, to reduce their length of study.
• (cryptography) A one way membership function.