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1. Any of various acids containing the peroxy group.
2. An inorganic acid, such as perchloric acid, containing the largest proportion of oxygen in a series of related oxyacids.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Elements & Compounds) an acid, such as perchloric acid, in which the element forming the acid radical exhibits its highest valency
2. (Elements & Compounds) (not in technical usage) an acid, such as persulphuric acid, that contains the -OOH group. Recommended names: peroxo acid or peroxy acid
peracidity n
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(pərˈæs ɪd)

an oxyacid, the primary element of which is in its highest possible oxidation state, as perchloric acid, HClO4, and permanganic acid, HMnO4.
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