|pər, (ˈ)per+ noun
Etymology: International Scientific Vocabulary per- + sulfate
1. : a sulfate in which the metal has a relatively high valence
persulfate of iron Fe 2 (SO 4 ) 3
2. : a salt of persulfuric acid ; especially : a salt (as potassium persulfate) of the acid H 2 S 2 O 8