One of the mysteries of the English language finally explained.
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.
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