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Meaning of mesocyclone

mes•o•cy•clone

Pronunciation: (mez"u-sī'klōn, mes"-, mē"zu-, -su-), [key]
— n. Meteorol.
  1. a small cyclone that arises near a thunderstorm and is sometimes associated with the occurrence of tornadoes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.