py·​ro·​clas·​tic | \ ˌpī-rō-ˈkla-stik How to pronounce pyroclastic (audio) \

Definition of pyroclastic

: formed by or involving fragmentation as a result of volcanic or igneous action

Examples of pyroclastic in a Sentence

Recent Examples on the Web When Mount Pelée erupted, its pyroclastic terror passed beneath him. Nathaniel Rich, The New York Review of Books, 25 May 2022 The scientists discovered that the tomb's mortar was similar to that used in the walls of the Markets of Trajan: volcanic tephra from the pozzolane rosse pyroclastic flow, binding together large chunks of brick and lava aggregate. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 The color and texture indicate a mix of rock, ash, and acid gas, a superheated pyroclastic flow. Alex Perry, Outside Online, 15 Apr. 2020 Unlike the fine ash at Omo Kibish, the pumice at Shala is made of chunks of rock piled up to 20 meters thick thanks to ancient pyroclastic flows, and that is very date-able. Kiona N. Smith, Ars Technica, 21 Jan. 2022 But a 2001 study in Nature estimated a temperature of 300° Celsius (572° Fahrenheit) for the pyroclastic surge that destroyed Pompeii, sufficient to kill inhabitants in fractions of a second. Jennifer Ouellette, Ars Technica, 2 Dec. 2021 Earlier this month, the eruption of Semeru, Java's tallest mountain, ejected ash clouds and pyroclastic flows that killed at least 46 people and left several missing, while thousands were displaced. NBC News, 19 Dec. 2021 Saturday's blowout created what's known as pyroclastic flow, which are fast-moving clouds of lava, gas and ash. Angela Dewan And Masrur Jamaluddin, CNN, 8 Dec. 2021 Unlike Pompeii, Herculaneum was not blanketed with ash and pumice; it was buried only by a series of pyroclastic flows, which hardened into a layer of deep rock, through which workmen could dig narrow tunnels only with great difficulty. Rebecca Mead, The New Yorker, 22 Nov. 2021 See More

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

First Known Use of pyroclastic

1862, in the meaning defined above

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The first known use of pyroclastic was in 1862

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Last Updated

10 Jun 2022

Cite this Entry

“Pyroclastic.” Dictionary, Merriam-Webster, Accessed 28 Jun. 2022.

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