concentrator

== English == === Etymology === From concentrate + -or. === Pronunciation === === Noun === concentrator (plural concentrators) One who concentrates. (telecommunications) A hub. (mining) An apparatus for the separation of dry comminuted ore, by exposing it to intermittent puffs of air. (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. ==== Derived terms ==== === References === Edward H[enry] Knight (1877), “Concentrator”, in Knight’s American Mechanical Dictionary. […], volumes I (A–GAS), New York, N.Y.: Hurd and Houghton […], →OCLC.