Dictionary.com
definitions
  • synonyms

rock flour

See more synonyms for rock flour on Thesaurus.com
noun
  1. glacial meal.
Show More

Origin of rock flour

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for rock flour

Historical Examples

  • 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

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

    Your National Parks

    Enos A. Mills

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


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
Show More
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012