IPA: //haɪˈdroʊkwɪnoʊn//
KK: /haɪˈdroʊkwɪnoʊn/
A white crystalline substance used in photography, as an antioxidant, and in medicine to lighten skin pigmentation.
Hydroquinone is often used in skin creams to treat dark spots and hyperpigmentation.
Hydroquinone is formed from "hydro-" (from Greek "hydor", meaning water) and "quinone" (from Latin "quinone", derived from "quinic acid", which is related to the cinchona tree). The word refers to a chemical compound that is a derivative of benzene and is used in various applications, including skin lightening and photography, often involving water in its reactions.
Think of 'water' ('hydro-') being involved in a chemical compound related to 'quinone', which helps you remember that hydroquinone is a chemical used in various processes.