cyclone cyclone /sɪˈkloʊn/

noun

1. A violent rotating windstorm  ( cyclone )
   a violent rotating windstorm
    The coastal regions are always prepared for the potential threat of a cyclone.
   The coastal regions are always prepared for the potential threat of a cyclone.
   
   
2. (meteorology) rapid inward circulation of air masses about a low pressure center; circling counterclockwise in the Northern Hemisphere and clockwise in the southern  ( cyclone )
   (meteorology) rapid inward circulation of air masses about a low pressure center; circling counterclockwise in the Northern Hemisphere and clockwise in the southern
    Coastal regions must prepare for the devastating impacts of a cyclone.
   Coastal regions must prepare for the devastating impacts of a cyclone.