mesocyclone

[ mez-uh-sahy-klohn, mes-, mee-zuh-, -suh- ]
/ ˌmɛz əˈsaɪ kloʊn, ˌmɛs-, ˌmi zə-, -sə- /

noun Meteorology.

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. 2020