pyrolysis

noun

py·​rol·​y·​sis pī-ˈrä-lə-səs How to pronounce pyrolysis (audio)
: chemical change brought about by the action of heat
pyrolytic adjective
pyrolytically adverb

Examples of pyrolysis in a Sentence

Recent Examples on the Web
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While most fires utilize the combustion process, biochar is created via pyrolysis, which only occurs in the absence of oxygen. Lauren Landers, Better Homes & Gardens, 21 Apr. 2026 The main method, a process known as pyrolysis, has long been regulated as incineration by the Clean Air Act. ABC News, 15 Apr. 2026 These specific chemical properties render the material an ideal candidate for pyrolysis and facilitate the production of both bio-oil and biochar. Mrigakshi Dixit, Interesting Engineering, 14 Apr. 2026 As the capsule dipped into the atmosphere, internal layers became scorching hot through a process called pyrolysis, trapping gas. Catherina Gioino, Fortune, 11 Apr. 2026 See All Example Sentences for pyrolysis

Word History

Etymology

New Latin

First Known Use

circa 1890, in the meaning defined above

Time Traveler
The first known use of pyrolysis was circa 1890

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Cite this Entry

“Pyrolysis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pyrolysis. Accessed 29 Apr. 2026.

Medical Definition

pyrolysis

noun
py·​rol·​y·​sis pī-ˈräl-ə-səs How to pronounce pyrolysis (audio)
plural pyrolyses -ˌsēz How to pronounce pyrolysis (audio)
: chemical change brought about by the action of heat
pyrolytic adjective

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