silt·​stone | \ ˈsilt-ˌstōn How to pronounce siltstone (audio) \

Definition of siltstone

: a rock composed chiefly of silt hardened by heat, pressure, or cementation

Examples of siltstone in a Sentence

Recent Examples on the Web The reddish-brown siltstone, orange sandstone, and green clay stone are eroded into intricate swirls, icicles, cones, and rounded rec rooms. John Phillips, Car and Driver, "Tested: 1995 Land Rover Defender 90 Goes Nowhere, Man," 24 Mar. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'siltstone.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of siltstone

circa 1920, in the meaning defined above

Keep scrolling for more

Learn More about siltstone

Time Traveler for siltstone

Time Traveler

The first known use of siltstone was circa 1920

See more words from the same year

Statistics for siltstone

Cite this Entry

“Siltstone.” Dictionary, Merriam-Webster, Accessed 18 Jan. 2021.

More from Merriam-Webster on siltstone Encyclopedia article about siltstone

Comments on siltstone

What made you want to look up siltstone? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Words of Snow and Ice Quiz

  • image1037863653
  • Which of the following refers to thin, bending ice, or to the act of running over such ice?
True or False

Test your knowledge - and maybe learn something along the way.


Anagram puzzles meet word search.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!