| cyclone [`sī´klōn] CHEMICAL ENGINEERING A static reaction vessel in which fluids under pressure form a vortex. MECHANICAL ENGINEERING Any cone-shaped air-cleaning apparatus operated by centrifugal separation that is used in particle collecting and fine grinding operations. METEOROLOGY A low-pressure region of the earth's atmosphere with roundish to elongated-oval ground plan, in-moving air currents, centrally upward air movement, and generally outward movement at various higher elevations in the troposphere. |