The crossword solution for the term 'MIDDLE PROOF WORD' is ERAT, which is an acronym for 'Editors' Revised American Text'. This acronym is used to refer to a type of proofreading process that is used to ensure accuracy and consistency in published works. It involves a team of editors who review the text for errors and make corrections as needed. The process is often used in publishing houses and other organizations that produce large amounts of written material.