The crossword solution for the term 'FORM A COIL' is WIND, which is a four-letter word. Winding is the process of forming a coil by wrapping a wire or other material around a core. This technique is used to create electrical coils, such as those found in transformers and motors, as well as to make springs and other mechanical components. Winding is also used to create decorative items such as jewelry and art objects.