Webster's English Dictionary

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tornado

tor.na.do \to.r-'na-d-(.)o-\ n or tornadoes or tornados [modif. of Sp 
   tronada thunderstorm, fr. tronar to thunder, fr. L  pl Xtonare - more at 
   THUNDER archaic  1: a tropical thunderstorm  2a: a squall accompanying a 
   thunderstorm in Africa  2b: a violent destructive whirling wind accompanied 
   by a funnel-shaped clou d that progresses in a narrow path over the land 3: 
   a violent or destructive windstorm : WHIRLWIND