ubiquinone

n.
A quinone compound that serves as an electron carrier between flavoproteins and in cellular respiration.

[Latin ubī(que), everywhere; see ubiquity + QUINONE.]

Coenzyme in the respiratory (electron transport) chain in mitochondria, also known as coenzyme Q or mitoquinone; widely distributed in nature. May have antioxidant activity, and supplements are sometimes sold as vitamin Q, although there is no evidence that it is a dietary essential.

(yū'bĭ-kwĭ-nōn', yū-bĭk'wə-nōn')
n.

A quinone compound that serves as an electron carrier between various flavoproteins and in cellular respiration.

Coenzyme Q; component of the electrontransfer chain of oxidative phosphorylation.

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The noun has one meaning:

Meaning #1: any of several quinones that function as electron-carrying coenzymes
  Synonym: coenzyme Q

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