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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
This method is a significant departure from traditional chemical recycling techniques like pyrolysis, which operate at lower temperatures (450–600°C) and produce over a hundred different by-products, many of which are useless. Aman Tripathi, Interesting Engineering, 3 Sep. 2025 Each facility has a pyrolysis reactor based on the Viking design that converts agricultural residues such as cashew hulls from area farms into biofuels and high-quality carbon credits for sale on international markets. Erik Kobayashi-Solomon, Forbes.com, 28 Aug. 2025 It is made using a chemical recycling process that combines the old tires with biomethane to create pyrolysis oil. Eileen Falkenberg-Hull, MSNBC Newsweek, 25 June 2025 Other chemical recycling methods, such as pyrolysis and gasification, have drawn environmental and health concerns because the plastic is heated, which can release toxic fumes. Alex Jordan, The Conversation, 16 Apr. 2025 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

Browse Nearby Words

Cite this Entry

“Pyrolysis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pyrolysis. Accessed 9 Sep. 2025.

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

More from Merriam-Webster on pyrolysis

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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