/perr"sul fyoor"ik, perr'-/ , Chem.
1. Also called Caro's acid, permonosulfuric acid, peroxymonosulfuric acid, peroxysulfuric acid . a white, crystalline solid, H 2 SO 5 , used as an oxidizing agent for certain organic compounds.
2. Also called peroxydisulfuric acid . a white, crystalline solid, H 2 S 2 O 8 , used in the manufacture of hydrogen peroxide.
[ 1880-85; PER- + SULFURIC ]