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: a bitter alkaloid C8H10N4O2 found especially in coffee, tea, cacao, and kola nuts and used medicinally as a stimulant and diuretic
Example Sentences
Her doctor told her to avoid caffeine.
Recent Examples on the Web For a small, quick hit of caffeine, learn to drink a strong Cuban coffee. 
Lois K. Solomon, Sun Sentinel, 31 Aug. 2022 That's of course thanks to the caffeine, a stimulant that can rev up your body's engine for the day. Marisa Cohen, Good Housekeeping, 3 Aug. 2022 In all studies, the benefit was enjoyed by those who drank both caffeinated and decaffeinated coffee – again, suggesting the benefit is from the myriad of bioactive substances in coffee as opposed to caffeine. Dr. Michael Daignault, USA TODAY, 9 June 2022 Still, there is wide variation in how people respond to caffeine. Patrick Wilson, Outside Online, 15 June 2020 After all, the amount of caffeine in a cup of coffee can vary wildly. CNN, 29 Aug. 2022 Many also went in search of caffeine to downtown Livingston, where there are a dozen independent coffee shops. Tunku Varadarajan, WSJ, 12 Aug. 2022 Green coffee extract in the drink gives you a bold boost of caffeine. Emily Vanschmus, Better Homes & Gardens, 4 Aug. 2022 Guarana seed is a source of caffeine, says Dobos, and that's where the temporary tightening effect comes in. Jihan Forbes, Allure, 24 July 2022 See More
Lois K. Solomon, Sun Sentinel, 31 Aug. 2022 That's of course thanks to the caffeine, a stimulant that can rev up your body's engine for the day. Marisa Cohen, Good Housekeeping, 3 Aug. 2022 In all studies, the benefit was enjoyed by those who drank both caffeinated and decaffeinated coffee – again, suggesting the benefit is from the myriad of bioactive substances in coffee as opposed to caffeine. Dr. Michael Daignault, USA TODAY, 9 June 2022 Still, there is wide variation in how people respond to caffeine. Patrick Wilson, Outside Online, 15 June 2020 After all, the amount of caffeine in a cup of coffee can vary wildly. CNN, 29 Aug. 2022 Many also went in search of caffeine to downtown Livingston, where there are a dozen independent coffee shops. Tunku Varadarajan, WSJ, 12 Aug. 2022 Green coffee extract in the drink gives you a bold boost of caffeine. Emily Vanschmus, Better Homes & Gardens, 4 Aug. 2022 Guarana seed is a source of caffeine, says Dobos, and that's where the temporary tightening effect comes in. Jihan Forbes, Allure, 24 July 2022 See More Word History
Etymology
German Kaffein, from Kaffee coffee, from French café
First Known Use
circa 1823, in the meaning defined above
Time Traveler
The first known use of caffeine was circa 1823 Phrases Containing caffeine
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