The term PRESSURE PREFIX can be solved by two crossword solutions: BARO (4 letters) and ACU (3 letters). BARO is a prefix derived from the Greek word 'baros' meaning weight or pressure. It is commonly used in meteorology to refer to atmospheric pressure. ACU is an abbreviation for the Latin phrase 'acupressura, ' which translates to 'pressure with the fingers.' This term is used in massage therapy to describe the application of pressure to specific points on the body.