Is “Lumen” a Scrabble word?
Yes
LUMEN
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 Lumen
/ˈluːmən/
noun
1.In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm.
2.The cavity or channel within a tube or tubular organ.
3.The cavity bounded by a plant cell wall.