There are four varieties of commercially viable coffee: Arabica, Liberica, Excelsa, and Robusta. Growers predominantly plant the Arabica species. Although less popular, Robusta tastes slightly more bitter and contains more caffeine.
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.
Source: Wiktionary
Con"cen*tra`tor, n. (Mining)
Definition: An apparatus for the separation of dry comminuted ore, by exposing it to intermittent puffs of air. Knight.
Source: Webster’s Unabridged Dictionary 1913 Edition
22 April 2025
(adjective) made smooth and bright by or as if by rubbing; reflecting a sheen or glow; “bright silver candlesticks”; “a burnished brass knocker”; “she brushed her hair until it fell in lustrous auburn waves”; “rows of shining glasses”; “shiny black patents”
There are four varieties of commercially viable coffee: Arabica, Liberica, Excelsa, and Robusta. Growers predominantly plant the Arabica species. Although less popular, Robusta tastes slightly more bitter and contains more caffeine.