Is “Diffusivity” a Scrabble word?
Yes
DIFFUSIVITY
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 Diffusivity
noun
1.A tendency to diffuse
2.A coefficient of diffusion; especially the amount of heat that passes through a given area in unit time