Caffeine, especially when it occurs in tea.
More 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.
Definition of theine in:
- The US English dictionary