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concentrator

The English word “concentrator” has 4 meanings listed here.

noun

  1. One who concentrates.
  2. A hub.
  3. An apparatus for the separation of dry comminuted ore, by exposing it to intermittent puffs of air.
  4. A frame or ring of wire or hard paper fitting into the cartridge case used in some shotguns, and holding the shot together when discharged, to secure close shooting; also, a device for slightly narrowing the bore at the muzzle for the same purpose.

Etymology

From concentrate + -or.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.