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noun ac·cu·mu·la·tor \ə-ˈkyü-m(y)ə-ˌlā-tər\

Definition of accumulator

  1. :  one that accumulates: as a :  a device (as in a hydraulic system) in which a fluid is collected and especially in which it is kept under pressure as a means of storing energy b British :  storage battery c :  a part (as in a computer) where numbers are totaled or stored

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