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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