The crossword solution for the term PREFIX WITH BEL is DECI. This prefix is derived from the Latin word decimus, which means 'TENTH.' It is used to denote a unit of measurement that is one-TENTH of the base unit. For example, a decimeter is one-TENTH of a meter, and a deciliter is one-TENTH of a liter. The prefix is often combined with the word 'BEL, ' which is a unit of sound intensity. Therefore, when the prefix 'deci' is combined with 'BEL, ' it creates a unit of sound intensity that is one-TENTH of a BEL.