CAFFEINE
caffeine, caffein
(noun) a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
Source: WordNet® 3.1
Etymology
Noun
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
Recent Word Finds
Word of the Day
24 May 2025
EARTHSHAKING
(adjective) sufficiently significant to affect the whole world; “earthshaking proposals”; “the contest was no world-shaking affair”; “the conversation...could hardly be called world-shattering”
Do you know this game?
Wordscapes is a popular word game consistently in the top charts of both Google Play Store and Apple App Store. The Android version has more than 10 million installs. This guide will help you get more coins in less than two minutes of playing the game. Continue reading Wordscapes: Get More Coins