The crossword solution for the term 'prefix with 'VIOLET'' is ULTRA. The word ULTRA is a Latin prefix meaning 'BEYOND' or 'on the far side of'. It is often used to describe something that is extreme or of the highest degree. For example, an ultramarathon is a race that is longer than a traditional marathon. When combined with the word 'VIOLET', it creates the word 'ultraviolet', which refers to the type of light that is BEYOND the visible spectrum of light.