The crossword solution for the term 'prefix with -logism' is NEO, which is a three-letter word. NEO is a prefix derived from the Greek word 'neos, ' meaning 'NEW.' It is commonly used in combination with other words to form NEW terms, such as 'NEOLOGISM, ' which refers to a newly coined word or phrase. NEO is also used in the context of 'neo-logism, ' which is a belief system that is based on modern ideas and values.