The term 'CORRECTIONAL PREFIX' is a five-letter word, 'ORTHO'. It is a prefix that is used to describe something that has been corrected or altered in some way. It is derived from the Greek word 'orthos', which means 'STRAIGHT' or 'RIGHT'. This prefix is often used in medical terminology to refer to a condition that has been corrected or improved. It is also used in other contexts, such as in engineering and linguistics, to refer to a change that has been made to improve something.