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}.
[1913 Webster]