The term 'long wave' refers to a type of wave motion that is characterized by its long wavelength. This type of wave is often seen in the ocean, where it is created by wind blowing over the surface of the water. The two crossword solutions for this term are 'ROLLER' and 'COMBER, ' both of which refer to the same phenomenon. A ROLLER is a wave that is created when the wind blows over the surface of the water, while a COMBER is a wave that is created when the wind blows against the shoreline. Both of these waves have a long wavelength, making them part of the long wave family.