photosystem

noun

pho·​to·​sys·​tem ˈfō-tō-ˌsi-stəm How to pronounce photosystem (audio)
: either of two photochemical reaction centers consisting chiefly of photosynthetic pigments complexed with protein and occurring in chloroplasts:
a
: one that absorbs light with a wavelength of about 700 nanometers

called also photosystem I

b
: one that absorbs light with a wavelength of about 680 nanometers

called also photosystem II

Examples of photosystem in a Sentence

Recent Examples on the Web Instead, for a safe, steady energy output, the pigments of the photosystem had to be very finely tuned in a certain way. Quanta Magazine, 30 July 2020

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'photosystem.' 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

1961, in the meaning defined above

Time Traveler
The first known use of photosystem was in 1961

Dictionary Entries Near photosystem

Cite this Entry

“Photosystem.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/photosystem. Accessed 30 Oct. 2024.

Love words? Need even more definitions?

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