cyclone UK /ˈsaɪ.kləʊn/US /ˈsaɪ.kloʊn/noun 5verb 4forms 3 noun5 •Any weather phenomenon consisting of a system of winds rotating around a centre of low atmospheric pressure; a low pressure system. •A tropical cyclone occurring in the South Pacific or Indian Ocean. •(informal) The more or less violent, small-scale circulations such as tornadoes, waterspouts, and dust devils. •(informal) A strong wind. •A cyclone separator; the cylindrical vortex tube within such a separator verb4 •To storm as a cyclone.What difference if it rained, hailed, blew, snowed, cycloned? — 1907 •To storm wildly; to be in a frenzy.The winds of change cycloned around Rhodesia and the debris began to fall within its borders. — 2013 •To whirl in spirals as a result of a cyclone or whirlwind-like force.White dust was cycloning at the bottom of ravines that cut for miles into the red flatness — 1997 •To separate using a cyclone separator.The product is cycloned and overflow at 45-50% solids is pumped to primary flotation where 50-70% of the copper is removed as a 21% concentrate. — 1977 formscycloned · cycloning · cyclones