The term 'spinnaker' is a type of SAIL used in sailing. It is a large, lightweight, asymmetrical SAIL that is designed to be flown in front of the boat when running downwind. It is typically triangular in shape and is used to increase the speed of the boat. The term 'spinnaker' is derived from the Dutch word 'spinnaker', which means 'SAIL'. The crossword solution for the term 'spinnaker' is 'SAIL', which is an accurate description of the type of SAIL it is.