Tornado Definition

tôr-nādō
tornadoes, tornados
noun
tornadoes, tornados
A violently whirling column of air, with wind speeds of about 100 to 300 miles per hour, extending downward from a cumulonimbus cloud, esp. in Australia and the central U.S.: usually appearing as a rapidly rotating, slender, funnel-shaped cloud and typically causing great destruction along its narrow path.
Webster's New World
In W Africa and the adjacent Atlantic, a severe thundersquall.
Webster's New World
Any whirlwind or hurricane.
Webster's New World

(meteorology) A violent windstorm characterized by a twisting, funnel-shaped cloud.

A tornado is a rotating column of air, pendant from a cumulonimbus cloud, and nearly always observable as a funnel cloud or tuba. Its vortex, meters in diameter, rotates counterclockwise in the northern hemisphere, and clockwise in the southern hemisphere, with wind speeds of 160 to more than 480 kilometres per hour.
Wiktionary
A rolled pork roast.
Wiktionary

Other Word Forms of Tornado

Noun

Singular:
tornado
Plural:
tornadoes, tornados

Origin of Tornado

  • Alteration (probably influenced by Spanish tornado turned) (past participle of tornar to turn) of Early Modern English ternado violent thunderstorm, hurricane from Spanish tronada thunderstorm from tronar to thunder from Latin tonāre (s)tenə- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Spanish tronada (thunderstorm), from tronar (to thunder), from Latin tonare (to thunder), from Proto-Indo-European *(s)tene- (to thunder). The 'o' and 'r' were reversed in English (metathesis) under influence of Spanish tornar (to twist, to turn), from Latin tornare (to turn).

    From Wiktionary

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