[ sem-ee-kwi-nohn, -kwin-ohn, sem-ahy- ]
/ ˌsɛm i kwɪˈnoʊn, -ˈkwɪn oʊn, ˌsɛm aɪ- /
any of the class of free radicals formed as intermediates in the oxidation of a hydroquinone to a quinone.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020