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semiquinone

[sem-ee-kwi-nohn, -kwin-ohn, sem-ahy-]
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noun Chemistry.
  1. any of the class of free radicals formed as intermediates in the oxidation of a hydroquinone to a quinone.
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Origin of semiquinone

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018