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concentrate +‎ -or


English Wikipedia has an article on:

concentrator (plural concentrators)

  1. One who concentrates.
    • 1960, Dissertation Abstracts, volume 20, page 4007:
      Experienced classroom teachers are well acquainted with the attention-seeker, the shy girl, the aggressive boy, the poor concentrator, the slow student []
  2. (telecommunications) A hub.
  3. (mining) An apparatus for the separation of dry comminuted ore, by exposing it to intermittent puffs of air.
  4. (firearms) 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.