noun Chemistry.
an oxyacid, the primary element of which is in its highest possible oxidation state, as perchloric acid, HClO 4 , and permanganic acid, HMnO 4 .

1895–1900; per- + acid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peracid (pɜːrˈæsɪd)
1.  an acid, such as perchloric acid, in which the element forming the acid radical exhibits its highest valency
2.  (not in technical usage) peroxo acid, Recommended names: peroxy acid an acid, such as persulphuric acid, that contains the -OOH group

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American Heritage
Medical Dictionary

peracid per·ac·id (pûr'ās'ĭd)

  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 acids.

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