- caffeine, especially in tea.
Origin of theine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for theine
Medically speaking, this theine has a totally distinctive action from the infusions of which it forms a244 part.
Theine, by being a restorative and an indirect sustainer and regulator of the circulation, may induce sleep.
It contains the same active principle, theine as tea and coffee, but not their volatile and empyreumatic oils.
The active principles of the leaves are theine and a volatile oil, to which latter the flavor and odor are due.
Dr Walter Blyth, commenting upon the above, says, the amount of theine is certainly understated.Cooley's Practical Receipts, Volume II
- another name for caffeine, esp when present in tea
C19: from New Latin thea tea + -ine ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012