Is “Ultrastructure” a Scrabble word?
Yes
ULTRASTRUCTURE
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 Ultrastructure
noun
1.The fine, detailed structure of a biological specimen that can only be observed by electron microscopy