The term 'PREFIX FOR FUNCTION' can be answered with two three-letter words: MAL and DYS. MAL is a prefix derived from the Greek word malakia, which means softness or weakness. It is often used to describe something that is not functioning properly or is impaired in some way. DYS is a prefix derived from the Greek word dys, which means bad or difficult. It is often used to describe something that is not functioning properly or is impaired in some way.