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.
THIOPHTHENE
Thi*oph"thene, n. Etym: [Abbreviated from thionaphthene.] (Chem.)
Definition: A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds. [Written also thiophtene.]
Source: Webster’s Unabridged Dictionary 1913 Edition
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12 June 2025
RAREFACTION
(noun) a decrease in the density of something; “a sound wave causes periodic rarefactions in its medium”
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