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mesocyclone

[mez-uh-sahy-klohn, mes-, mee-zuh-, -suh-]
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noun Meteorology.
  1. a small cyclone that arises near a thunderstorm and is sometimes associated with the occurrence of tornadoes.
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Origin of mesocyclone

First recorded in 1970–75; meso- + cyclone
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018