I thought it would be a lot harder, but it moved along.
cirrus (meteorology) - a cloud of a class characterized by thin white filaments or narrow bands and a composition of ice crystals: of high altitude, about 20, 000–40, 000 feet (6000–12, 000 meters).
cirrus (meteorology) - a cloud of a class characterized by thin white filaments or narrow bands and a composition of ice crystals: of high altitude, about 20, 000–40, 000 feet (6000–12, 000 meters).