• synonyms

rock dust

  1. a crushed limestone sprayed on surfaces in mines to make coal dust incombustible in case of a gas explosion.
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Origin of rock dust

First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for rock dust

Historical Examples

  • Rain and rock-dust had smeared all things alike in this gray roasting shambles.

    She Buildeth Her House

    Will Comfort

  • Little clouds of rock-dust rose above the bear, in front of him, behind him, and below him.

    Tenting To-night

    Mary Roberts Rinehart

  • The flame of the explosion can't pass through and the fire can't jump a rock-dust barrier.

    The Boy With the U.S. Miners

    Francis Rolt-Wheeler