Is “Photoperiodism” a Scrabble word?
Yes
PHOTOPERIODISM
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 Photoperiodism
noun
1.The growth, development and other responses of plants and animals according to the length of day and/or night.