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hydraulic accumulator

noun
  1. an apparatus in which gas, usually air, is used as a cushion or shock absorber in a hydraulic system.
  2. (in a hydraulic system) an apparatus for storing energy.
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Origin of hydraulic accumulator

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018