caffeine, caffein
(noun) a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
Source: WordNet® 3.1
caffeine (usually uncountable, plural caffeines)
An alkaloid, C8H10N4O2, found naturally in tea and coffee plants which acts as a mild stimulant on the central nervous system. [from 1830]
Coordinate terms: guaranine, mateine, theine
Source: Wiktionary
Caf*fe"ine, n. Etym: [Cf. F. caféine. See Coffee.] (Chem.)
Definition: A white, bitter, crystallizable substance, obtained from coffee. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana.
Source: Webster’s Unabridged Dictionary 1913 Edition
6 April 2025
(noun) a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an erect position by arching the back and swinging the legs out and down while forcing the chest upright
The earliest credible evidence of coffee-drinking as the modern beverage appeared in modern-day Yemen. In the middle of the 15th century in Sufi shrines where coffee seeds were first roasted and brewed for drinking. The Yemenis procured the coffee beans from the Ethiopian Highlands.
