plural tornadoes or tornados
Definition of tornado
1a
: a violent destructive whirling wind accompanied by a funnel-shaped cloud that progresses in a narrow path over the land
b
: a squall accompanying a thunderstorm in Africa
2
: a violent windstorm : whirlwind
3
archaic
: a tropical thunderstorm
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Merriam-Webster unabridged
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Time Traveler for tornado
The first known use of tornado was in 1556
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