Definition of Caffeine

1. Noun. A bitter alkaloid found in coffee and tea that is responsible for their stimulating effects.

Exact synonyms: Caffein
Substance meronyms: Coffee, Java, Tea
Generic synonyms: Alkaloid
Derivative terms: Caffeinic

Definition of Caffeine

1. n. A white, bitter, crystallizable substance, obtained from coffee. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana.

Definition of Caffeine

1. Noun. An alkaloid, C8H10N4O2, found naturally in tea and coffee plants which acts as a mild stimulant of the central nervous system. ¹

¹ Source:

Definition of Caffeine

1. a bitter alkaloid used as a stimulant [n -S]

Medical Definition of Caffeine

1. A xanthine derivative that elevates cAMP levels in cells by inhibiting phosphodiesterases. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Caffeine Pictures

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Lexicographical Neighbors of Caffeine

caffe latte
caffeate O-methyltransferase
caffeate peroxidase
caffeic acid
caffeic acids
caffein addict
caffein addiction
caffeine (current term)
caffeine addict
caffeine and sodium benzoate
caffeine and sodium salicylate
caffeine citrate
caffeine hydrate
caffeoyl-CoA O-methyltransferase

Literary usage of Caffeine

Below you will find example usage of this term as found in modern and/or classical literature:

1. The American Journal of the Medical Sciences by Southern Society for Clinical Investigation (U.S.) (1887)
"Ox THE ACTION OF caffeine AS A DIURETIC. In an elaborate research into the ... In caffeine we have a remedy whose action on the kidney may be compared to ..."

2. American Druggist (1884)
"THE medicinal use of caffeine and of its salts has not hitherto been very considerable, it having been confined to the treatment of hemicrania and ..."

3. A Dictionary of Applied Chemistry by Thomas Edward Thorpe (1921)
"caffeine ia obtained industrially almost entirely from tea dust or damaged tea. ... caffeine dissolves without colouration in concentrated sulphuric acid or ..."

4. Journal of Nervous and Mental Disease by American Neurological Association, Philadelphia Neurological Society, Chicago Neurological Society, New York Neurological Association, Boston Society of Psychiatry and Neurology (1890)
"With warm water, it is claimed that it is possible to dissolve seven and one-half grains of caffeine in one hundred and sixty minims of distilled water, ..."

5. Hand-book of Chemistry by Leopold Gmelin, Henry Watts (1859)
"caffeine crystallised from water contains water of crystallisation (Pfaff and ... The aqueous solution of caffeine is not altered by boracic, phosphoric, ..."

6. A Dictionary of Chemistry and the Allied Branches of Other Sciences by Henry Watts (1870)
"From this residue, caffeine may be obtained, either by sublimation, ... After distilling off1 the ether, feebly coloured caffeine crystallises, ..."

7. A Textbook of pharmacology and therapeutics, or, the Action of drugs in by Arthur Robertson Cushny (1906)
"Vm. caffeine. In a mini -er of plants used In different parts of the world to ... Besides, caffeine and its allies in moderate quantities induce no marked ..."

8. Commercial Organic Analysis: A Treatise on the Properties, Proximate by Alfred Henry Allen (1892)
"None of the compounds of caffeine are sufficiently stable or insoluble to be ... The isolation of caffeine presents no difficulty, and may be effected by a ..."

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