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theine

[thee-een, -in]
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noun
  1. caffeine, especially in tea.
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Origin of theine

1830–40; < New Latin the(a) tea + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for theine

theine

noun
  1. another name for caffeine, esp when present in tea
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Word Origin

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