Is “Directrix” a Scrabble word?
Yes
DIRECTRIX
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 Directrix
noun
1.A female who directs; a directress.
2.A line used to define a curve or surface; especially a line, the distance from which a point on a conic has a constant ratio to that from the focus.