al·​lyl ˈa-ləl How to pronounce allyl (audio)
: being or containing the unsaturated monovalent radical CH2CHCH2

Examples of allyl in a Sentence

Recent Examples on the Web According to the Academy of General Dentistry, the allyl methyl sulfide in coffee, onions and garlic can stay in your bloodstream and be expelled via your breath up to 72 hours after consumption. Sandee Lamotte, CNN, 5 May 2020

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

Word History


International Scientific Vocabulary, from Latin allium garlic

First Known Use

1845, in the meaning defined above

Time Traveler
The first known use of allyl was in 1845

Dictionary Entries Near allyl

Cite this Entry

“Allyl.” Dictionary, Merriam-Webster, Accessed 3 Mar. 2024.

Medical Definition


al·​lyl ˈal-əl How to pronounce allyl (audio)
often attributive
: an unsaturated monovalent radical C3H5 compounds of which are found in the oils of garlic and mustard
allylic adjective

More from Merriam-Webster on allyl

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