1. meteorology large-scale storm system: a large-scale storm system with heavy rain and winds that rotate counterclockwise in the northern hemisphere and clockwise in the southern hemisphere around and toward a low-pressure center. See also anticyclone
2. meteorology violent storm: a violent rotating windstorm or tornado
3. technology rotating device: a device that rotates rapidly, using centrifugal force to separate materials, e.g. particles from a gas
