shale

noun

: a fissile rock that is formed by the consolidation of clay, mud, or silt, has a finely stratified or laminated structure, and is composed of minerals essentially unaltered since deposition
shaley adjective
or less commonly shaly

Examples of shale in a Sentence

Recent Examples on the Web
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Ironically, the studies revealed that wet clay shale rocks along the Darién route meant nuclear explosives might not work well there. The Conversation, Fortune, 3 Apr. 2026 Ironically, the studies revealed that wet clay shale rocks along the Darién route meant nuclear explosives might not work well there. Christine Keiner, The Conversation, 2 Apr. 2026 Since its nationalization, YPF has accelerated the development of Argentina's vast shale gas reserves in the Vaca Muerta field in Patagonia. ABC News, 27 Mar. 2026 But oil companies learned hard lessons during the shale boom of the 2010s about the risks of chasing short-term price signals, and more pushback could be coming soon. Tim McDonnell, semafor.com, 26 Mar. 2026 See All Example Sentences for shale

Word History

Etymology

probably from obsolete or dialect shale scale, shell, from Middle English, from Old English scealu — more at shell

First Known Use

1747, in the meaning defined above

Time Traveler
The first known use of shale was in 1747

Browse Nearby Words

Cite this Entry

“Shale.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/shale. Accessed 5 Apr. 2026.

Kids Definition

shale

noun
: a rock with a fine grain formed from clay, mud, or silt
shaley adjective

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