The term 'prefix for lateral' refers to words that are used to describe something that is located on the side of something else. The crossword solutions for this term are TRI (3 letters), UNI (3 letters), EQUI (4 letters), and MULTI (5 letters). TRI means three, UNI means one, EQUI means equal, and MULTI means many. These words can be used to describe the number of sides or points of something that is located on the side of something else. For example, a triangle has three sides, a unilateral shape has one side, an equilateral shape has equal sides, and a multilateral shape has many sides.