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semiquinone

[sem-ee-kwi-nohn, -kwin-ohn, sem-ahy-] /ˌsɛm i kwɪˈnoʊn, -ˈkwɪn oʊn, ˌsɛm aɪ-/
noun, Chemistry.
1.
any of the class of free radicals formed as intermediates in the oxidation of a hydroquinone to a quinone.
Origin of semiquinone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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