Answer: polars

AnswerCrossword Clue
POLARSPlane curves in math.
POLARSGeometric curves.
POLARSConic lines in geometry
POLARSCertain secants
polarsPOLAR, a straight line related to a point
polarsA variable binary star that emits strongly polarized light, one component being a strongly magnetic white dwarf
polarsThe straight line joining the two points at which tangents from a fixed point touch a conic section