caffeine or caf·fein [ka- feen, kaf-een, kaf-ee-in] EXAMPLES | WORD ORIGIN noun . Chemistry, Pharmacology a white, crystalline, bitter alkaloid, C 8H 10N 4O 2, usually derived from coffee or tea: used in medicine chiefly as a nervous system stimulant. Origin of caffeine 1820–30;
-ine -ine 2 Related forms caf·fein·ic , [ka- fee-nik, kaf-ee- in-ik] /kæˈfi nɪk, ˌkæf iˈɪn ɪk/ adjective non·caf·feine, noun non·caf·fein·ic, adjective
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for caffein Historical Examples of caffein
Tannic acid, not as free acid, is combined with
caffein as a tannate.
The beans are then steam distilled to remove the
caffein, dried, and roasted.
The chief factors in coffee goodness are the
caffein content and the caffeol.
Salts of an unstable nature are formed with
caffein by most acids.
Weigh the residue as
caffein and calculate on 7.5 grams of coffee. British Dictionary definitions for caffein noun a white crystalline bitter alkaloid responsible for the stimulant action of tea, coffee, and cocoa: a constituent of many tonics and analgesics. Formula: C 8 H 10 N 4 O 2 See also xanthine (def. 2) Word Origin for caffeine
C19: from German
Kaffein, from Kaffee coffee
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for caffein n.
trimethyl-derivative of xanthine, 1830, from German
Kaffein, coined by chemist F.F. Runge (1795-1867), apparently from German Kaffee "coffee" (see coffee) + chemical suffix -ine (2) (German -in). The form of the English word may be via French caféine.
Online Etymology Dictionary, © 2010 Douglas Harper
n. A bitter white alkaloid often derived from tea or coffee and used chiefly as a mild stimulant and in the treatment of certain kinds of headache.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
A bitter white alkaloid found in tea leaves, coffee beans, and various other plant parts. It is a mild stimulant. Caffeine is a xanthine and similar in structure to theobromine and theophylline. Chemical formula: C 8H 10N 4O 2.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.