pho·​to·​dis·​so·​ci·​a·​tion ˌfō-tō-di-ˌsō-sē-ˈā-shən How to pronounce photodissociation (audio)
: dissociation of the molecules of a substance (such as water) caused by absorption of radiant energy
photodissociate verb

Example Sentences

Recent Examples on the Web Although there are many ideas that involve molecular oxygen, it’s only found in tiny, trace amounts from the photodissociation of water. Ethan Siegel, Forbes, 11 Mar. 2021

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'photodissociation.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1907, in the meaning defined above

Time Traveler
The first known use of photodissociation was in 1907

Dictionary Entries Near photodissociation

Cite this Entry

“Photodissociation.” Dictionary, Merriam-Webster, Accessed 30 May. 2023.

More from Merriam-Webster on photodissociation

Love words? Need even more definitions?

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