Is “Massing” a Scrabble word?
Yes
MASSING
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 Massing
verb
1.To form or collect into a mass; to form into a collective body; to bring together into masses; to assemble.
2.To have a certain mass.
“I mass 70 kilograms.”
verb
1.To celebrate mass.
noun
1.A bringing together into a mass.