corrector

A corrector (English plural correctors, Latin plural correctores) is a person or object practicing correction, usually by removing or rectifying errors. The word is originally a Roman title, corrector, derived from the Latin verb corrigere, meaning "to make straight, set right, bring into order." Apart from the general sense of anyone who corrects mistakes, it has been used as, or part of (some commonly shortened again to Corrector), various specific titles and offices, sometimes quite distant from the original meaning.