Meaning of theine in English:


Pronunciation /ˈθiːiːn/ /ˈθiːɪn/


mass noun
  • Caffeine, especially when it occurs in tea.

    ‘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) + -ine.