WordReference Random House Unabridged Dictionary of American English © 2017
nu•ée ar•dente  (Fr. ny ā arnt),USA pronunciation pl.  nu•ées ar•dentes (Fr. ny ā zarnt).USA pronunciation [Geol.]
  1. Geology(in a volcanic eruption) a swiftly flowing, dense cloud of hot gases, ashes, and lava fragments.
  • French: literally, burning cloud
  • 1900–05

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