Dictionary

photosystem

noun pho·to·sys·tem \ˈfō-tō-ˌsis-təm\

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
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First Known Use of PHOTOSYSTEM

1964

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