The term 'refine further' can be summarized by the crossword solution 'RAREFY, ' which is a six-letter word. Rarefying is a process of making something more refined or pure by removing impurities. It is often used in chemistry to describe the process of purifying a substance, such as a gas or liquid, by reducing its density. In other contexts, it can refer to the process of making something more precise or detailed.