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peracid per·ac·id (pûr'ās'ĭd)
Any of various acids containing the peroxy group.
An inorganic acid, such as perchloric acid, containing the largest proportion of oxygen in a series of related acids.
any of a class of chemical compounds in which the atomic group OOH replaces the OH group of an oxy acid (a compound in which a hydrogen atom is attached to an oxygen atom by a covalent bond that is easily broken, producing an anion and a hydrogen ion). Examples of peroxy acids are peroxyacetic acid (CH3COOOH, related to acetic acid, CH3COOH) and peroxysulfuric acid (HOSO2OOH, or H2SO5, analogous to sulfuric acid, HOSO2OH, or H2SO4).