Definition of theine in English:

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Pronunciation: /ˈTHēēn/
Pronunciation: /ˈTHēin/


Caffeine, especially when it occurs in tea.
Example sentences
  • Eventually it was shown that the theine of tea was identical with the caffeine of coffee, and the term theine was then dropped.
  • Analysis certificates are issued for each processed batch; these certificates also state the percentage of theine and residues still left.


Mid 19th century: from modern Latin Thea (former genus name of the tea plant, from Dutch thee) + -ine4.

For editors and proofreaders

Syllabification: the·ine

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