The Collaborative International Dictionary of English v.0.48:

Tornado \Tor*na"do\, 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]

WordNet (r) 3.0 (2006):

tornado
    n 1: a localized and violently destructive windstorm occurring
         over land characterized by a funnel-shaped cloud extending
         toward the ground [syn: tornado, twister]
    2: a purified and potent form of cocaine that is smoked rather
       than snorted; highly addictive [syn: crack, crack
       cocaine, tornado]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "tornado":
   baguio, blaze, burst, convulsion, cyclone, dirty weather,
   dust devil, eruption, explosion, fit, flare-up, foul weather, gale,
   gust, hurricane, irruption, line squall, outbreak, outburst,
   paroxysm, rainspout, rainstorm, rotary storm, rough weather,
   sand column, sandspout, seizure, snowstorm, spasm, squall, storm,
   stormy weather, tempest, tempestuous rage, thunderstorm, twister,
   typhoon, upheaval, waterspout, whirlblast, whirlwind, wind eddy,
   windstorm



The Free On-line Dictionary of Computing (30 December 2018):

Tornado

    The software development environment
   previously distributed with VxWorks.

   (1996-11-29)


U.S. Gazetteer Places (2000):

Tornado, WV -- U.S. Census Designated Place in West Virginia
   Population (2000):    1111
   Housing Units (2000): 437
   Land area (2000):     3.595035 sq. miles (9.311097 sq. km)
   Water area (2000):    0.084938 sq. miles (0.219989 sq. km)
   Total area (2000):    3.679973 sq. miles (9.531086 sq. km)
   FIPS code:            80764
   Located within:       West Virginia (WV), FIPS 54
   Location:             38.341801 N, 81.849474 W
   ZIP Codes (1990):     25202
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Tornado, WV
    Tornado