concentrator
noun 4
Definitions
noun
1
One who concentrates.
Experienced classroom teachers are well acquainted with the attention-seeker, the shy girl, the aggressive boy, the poor concentrator, the slow student […]
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
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