Is “Photosystem” a Scrabble word?
Yes
PHOTOSYSTEM
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Photosystem
noun
1.Either of two biochemical systems, active in chloroplasts, that are part of photosynthesis