Is “Crustal” a Scrabble word?
Yes
CRUSTAL
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 Crustal
/ˈkɹʌstəl/
adjective
1.Of, pertaining to, or forming a crust, especially the crust of the Earth or other planet.