Is “Calx” a Scrabble word?
Yes
CALX
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 Calx
/kælks/
noun
1.The substance which remains after a metal or mineral has been thoroughly burnt, once seen as being the essential substance left after the expulsion of phlogiston, but now recognised as being the metallic oxide (or, in some cases, the metal in a state of sublimation).
2.In the Eton College wall game, an area at the end of the field where a shy can be scored by lifting the ball against the wall with one's foot.