GNU Collaborative International Dictionary of English

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1.       
   Tornado , n.; pl. Tornadoes . [From Sp. or Pg. tornar to turn, return, L. tornare to turn, hence, a whirling wind. The Sp. & Pg. tornada is a return. See Turn.] A violent whirling wind; specifically (Meteorol.), a tempest distinguished by a rapid whirling and slow progressive motion, usually accompaned with severe thunder, lightning, and torrents of rain, and commonly of short duration and small breadth; a small cyclone.
   1913 Webster