: any of a group of lipid-soluble quinones that are found especially in mitochondria, have an isoprenoid side chain, and function in oxidative phosphorylation as electron-carrying coenzymes in electron transport

Examples of ubiquinone in a Sentence

Recent Examples on the Web Form There are two forms of CoQ10: ubiquinone and ubiquinol. Isabel Vasquez Rd Ldn, Verywell Health, 31 July 2023 Made up of five alpha- and beta-hydroxy acids and antioxidants (including retinol, ubiquinone and resveratrol), this combination will protect and smooth the complexion, as well as restore uniformity of tone. Felicity Carter, Forbes, 1 Aug. 2022

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

Word History


blend of Latin ubique everywhere and English quinone; from its widespread occurrence in nature

First Known Use

1958, in the meaning defined above

Time Traveler
The first known use of ubiquinone was in 1958

Dictionary Entries Near ubiquinone

Cite this Entry

“Ubiquinone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ubiquinone. Accessed 28 Feb. 2024.

Medical Definition


: any of a group of lipid-soluble quinones that contain a long isoprenoid side chain and that function in the part of cellular respiration comprising oxidative phosphorylation as electron-carrying coenzymes in the transport of electrons from organic substrates to oxygen especially along the chain of reactions leading from the Krebs cycle
especially : coenzyme q10

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