The Collaborative International Dictionary
Hydroquinone \Hy`dro*qui"none\, n. [Hydro-, 2 + quinone.] (Chem.) A white crystalline substance, C6H4(OH)2, obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric with, pyrocatechin and resorcin. Called also dihydroxy benzene.
Wiktionary
n. (context organic compound English) The diphenol para-dihydroxy benzene, used as a mild reducing agent in photographic developing; isomeric with catechol and resorcinol.
Wikipedia
Hydroquinone, also benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, a derivative of benzene, having the chemical formula CH(OH). Its chemical structure, shown in the table at right, features two hydroxyl groups bonded to a benzene ring in a para position. It is a white granular solid. Substituted derivatives of this parent compound are also referred to as hydroquinones. The name "hydroquinone" was coined by Friedrich Wöhler in 1843.
Usage examples of "hydroquinone".
I poured the hydrogen peroxide into the hydroquinone, and absolutely nothing happened.
It is true that it squirts a scaldingly hot mixture of hydrogen peroxide and hydroquinone at enemies.