polar

Etymology

From Late Latin polāris , equivalent to pole + -ar.

adj

1. Of or having a pole or polarity.
2. (geography) Of, relating to, measured from, or referred to a geographic pole (the North Pole or South Pole); within the Arctic or Antarctic circles.
3. (space sciences) Of an orbit that passes over, or near, one of these poles.
4. (chemistry) Having a dipole; ionic.
5. (mathematics) Of a coordinate system, specifying the location of a point in a plane by using a radius and an angle.
6. (linguistics, of a question) Having but two possible answers, yes and no.

noun

1. (geometry) The line joining the points of contact of tangents drawn to meet a curve from a point called the pole of the line.