Meaning of nuée ardente

nu•ée ar•dente

Pronunciation: (Fr. ny-ā ar-dänt'), [key]
— pl. nu•ées ar•dentes
  1. (in a volcanic eruption) a swiftly flowing, dense cloud of hot gases, ashes, and lava fragments.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.