photosystem

noun
pho·​to·​sys·​tem | \ˈfō-tō-ˌsi-stəm \

Definition of photosystem 

: 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

First Known Use of photosystem

1961, in the meaning defined above

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The first known use of photosystem was in 1961

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