The term 'PROJECTILE TRACK' is composed of two words: 'PROJECTILE' and 'TRACK'. PROJECTILE is an object that is propelled by a force, such as a bullet or a rocket. TRACK is a path or course along which something moves or follows. Therefore, the term 'PROJECTILE TRACK' refers to the path that a PROJECTILE follows when it is propelled by a force. The crossword solution for this term is ARC, which stands for the curved path that a PROJECTILE follows when it is propelled by a force.