theophylline

 
Pronunciation: /θɪəˈfɪliːn, -lɪn/

noun

[mass noun] Chemistry
  • a bitter crystalline compound present in small quantities in tea leaves, isomeric with theobromine.

Origin:

late 19th century: from modern Latin Thea (former genus name of the tea plant, from Dutch thee) + Greek phullon 'leaf' + -ine4