rock dust


noun

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

Origin of rock dust

First recorded in 1930–35

Example sentences from the Web for rock dust

  • 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
  • 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