meth·​yl·​xan·​thine ˌme-thəl-ˈzan-ˌthēn How to pronounce methylxanthine (audio)
: a methylated xanthine derivative (such as caffeine, theobromine, or theophylline)

Examples of methylxanthine in a Sentence

Recent Examples on the Web The shells contain two chemical compounds called methylxanthines that are also found in chocolate — theobromine and caffeine. Tim Johnson, Chicago Tribune, 14 May 2023 Most of us are familiar with the most talked about methylxanthine — caffeine. Adele Jackson-Gibson, Good Housekeeping, 1 Nov. 2022

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'methylxanthine.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1949, in the meaning defined above

Time Traveler
The first known use of methylxanthine was in 1949

Dictionary Entries Near methylxanthine

Cite this Entry

“Methylxanthine.” Dictionary, Merriam-Webster, Accessed 27 May. 2024.

Medical Definition


meth·​yl·​xan·​thine ˌmeth-əl-ˈzan-ˌthēn How to pronounce methylxanthine (audio)
: a methylated xanthine derivative (as caffeine, theobromine, or theophylline)

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