thein
/ˈθiːɪn/
noun
- A bitter compound found in tea leaves, identical to caffeine; another name for caffeine when referring to its presence in tea.
- The amount of thein in green tea is lower than in black tea.
- Some people prefer tea because they find thein less harsh on the stomach than coffee's caffeine.
- Thein gives tea its stimulating effect, similar to the caffeine in coffee.
Synonyms