The Collaborative International Dictionary
Persalt
Persalt \Per"salt`\, n. (Chem.) A term formerly given to the salts supposed to be formed respectively by neutralizing acids with certain peroxides.
Wiktionary
persalt
n. (context chemistry English) The form of a salt of a particular base / acid combination in which the base has the highest valency; i.e. the salt formally derived from a peroxide