peracid

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various acids containing the peroxy group.
• noun An inorganic acid, such as perchloric acid, containing the largest proportion of oxygen in a series of related oxyacids.

from The Century Dictionary.

• noun An acid containing more than the usual amount of oxygen, as acetperacid (CH₃CO₂.OH), and benzoperacid (C₆H₅.C0₂.OH). Many of the peracids are extremely powerful germicides.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry Any acid that contains a peroxy group - e.g. peracetic acid
• noun inorganic chemistry The oxyacid of a particular element that has the largest number of oxygen atoms - e.g. perchloric acid