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.
Back"staff`, n.
Definition: An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed.
Source: Webster’s Unabridged Dictionary 1913 Edition
16 March 2025
(adjective) (of undissolved particles in a fluid) supported or kept from sinking or falling by buoyancy and without apparent attachment; “suspended matter such as silt or mud...”; “dust particles suspended in the air”; “droplets in suspension in a gas”
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.