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.
CYANOGEN
cyanogen
(noun) a colorless toxic gas with a pungent almond odor; has been used in chemical warfare
Source: WordNet® 3.1
Etymology
Noun
cyanogen (countable and uncountable, plural cyanogens)
(organic compound) The pseudohalogen (CN)2; a colourless, poisonous gas used as a rocket propellant, an insecticide and in chemical warfare.
Synonyms: ethanedinitrile, oxalonitrile, dicyanogen, nitriloacetonitrile
(chemistry) The radical -CN.
Source: Wiktionary
Cy*an"o*gen (s-n"-jn), n. Etym: [Gr. -gen: cf. F. cyanogène. So called because it produced blue dyes.] (Chem.)
Definition: A colorless, inflammable, poisonous gas, C2N2, with a peach- blossom odor, so called from its tendency to form blue compounds; obtained by heating ammonium oxalate, mercuric cyanide, etc. It is obtained in combination, forming an alkaline cyanide when nitrogen or a nitrogenous compound is strongly ignited with carbon and soda or potash. It conducts itself like a member of the halogen group of elements, and shows a tendency to form complex compounds. The name is also applied to the univalent radical, CN (the half molecule of cyanogen proper), which was one of the first compound radicals recognized.
Note: Cyanogen is found in the commercial substances, potassium cyanide, or prussiate of potash, yellow prussiate of potash, Prussian blue, Turnbull's blue, prussic acid, etc.
Source: Webster’s Unabridged Dictionary 1913 Edition
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(noun) an assemblage of parts that is regarded as a single entity; “how big is that part compared to the whole?”; “the team is a unit”
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