Is “Protium” a Scrabble word?
Yes
PROTIUM
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 Protium
noun
1.An atom of this isotope.
Synonyms: H-1, hydrogen-1, hydrogen-one, U-1, unium-1, unium-one