“+...- noun
Etymology: per- + chloric
: a fuming liquid strong acid HClO 4 that is the highest oxygen acid of chlorine, that is a powerful oxidizing agent when heated, is corrosive, and is explosive in contact with combustible material, that is usually made by treating a perchlorate (as sodium perchlorate) with acid, and that is used chiefly in chemical analysis, in electroplating, and as a catalyst