rock flour


Origin of rock flour

1
First recorded in 1880–85

Words Nearby rock flour

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use rock flour in a sentence

  • Nearly all of the soil in the Park is rock-flour that was ground by glaciers, and in part distributed by them.

    Your National Parks | Enos A. Mills
  • The product of plucking is bowlders, while the product of abrasion is fine rock flour and sand.

    The Elements of Geology | William Harmon Norton
  • Mountains were moved piecemeal, and ground to boulders, pebbles, and rock-flour in the moving.

    The Spell of the Rockies | Enos A. Mills
  • Indeed the resemblance is so close that the clay produced by this grinding action is often called rock flour.

  • Mountains are moved piecemeal, and are ground to boulders, pebbles, and rock-flour in the moving.

    Your National Parks | Enos A. Mills

British Dictionary definitions for rock flour

rock flour

noun
  1. very finely powdered rock, produced when rocks are ground together (as along the faces of a moving fault or during the motion of glaciers) and are thus chemically unweathered

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