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theine

American  
[thee-een, -in] / ˈθi in, -ɪn /

noun

  1. caffeine, especially in tea.


theine British  
/ ˈθiːiːn, -ɪn /

noun

  1. another name for caffeine, esp when present in tea

"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

Etymology

Origin of theine

First recorded in 1830–40; from New Latin the(a) “tea” ( see origin at tea) + -ine 2

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Both theine and tannin are more abundant in green than in black tea.

From Science in the Kitchen. by Mrs. E. E. Kellogg

Its active principle is identical with theine, of which it contains a larger quantity than exists in any other known plant, being more than double that contained in the best black tea.

From Catalogue of Economic Plants in the Collection of the U. S. Department of Agriculture by William Saunders

It possesses properties similar to the leaves of coca and contains theine.

From Catalogue of Economic Plants in the Collection of the U. S. Department of Agriculture by William Saunders

The flavor of both is due to a principle, theine in tea, caffeine in coffee, in which both the good and the ill effects of these drinks are bound up.

From The Easiest Way in Housekeeping and Cooking Adapted to Domestic Use or Study in Classes by Helen Campbell

The active principle of tea is called theine; that of coffee, caffeine, and of cocoa, theobromine.

From A Practical Physiology by Albert F. Blaisdell

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