The term SUFFIX WITH CYTO- is referring to the suffix 'plasm, ' which is a five letter word. Plasm is a suffix that is used to refer to a substance or material, usually in a cellular context. It is derived from the Greek word 'PLASMA, ' which means 'something molded or formed.' The suffix is often used to describe the cytoplasm of a cell, which is the material that makes up the majority of the cell's interior.