caffeine

or caf·fein

[ ka-feen, kaf-een, kaf-ee-in ]
/ kæˈfin, ˈkæf in, ˈkæf i ɪn /

noun Chemistry, Pharmacology.

a white, crystalline, bitter alkaloid, C8H10N4O2, usually derived from coffee or tea: used in medicine chiefly as a nervous system stimulant.

Nearby words

  1. cafeteria-style,
  2. cafetiere,
  3. cafetorium,
  4. caff,
  5. caffeinated,
  6. caffeinic,
  7. caffeinism,
  8. caffey's disease,
  9. caffey's syndrome,
  10. caffè latte

Origin of caffeine

1820–30; < French caféine, equivalent to café coffee + -ine -ine2

Related formscaf·fein·ic [ka-fee-nik, kaf-ee-in-ik] /kæˈfi nɪk, ˌkæf iˈɪn ɪk/, adjectivenon·caf·feine, nounnon·caf·fein·ic, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for caffeine


British Dictionary definitions for caffeine

caffeine

caffein

/ (ˈkæfiːn, ˈkæfɪˌiːn) /

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 2See 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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for caffeine

caffeine

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

Medicine definitions for caffeine

caffeine

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.

Science definitions for caffeine

caffeine

[ kă-fēn ]

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: C8H10N4O2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.