A species of willow, Salix polaris

The aurora borealis or aurora australis.

Synonym of Arctic wolf (“Canis lupus arctos”)

A husky.

plural of polar dog

A correspondence between the points in the plane of a triangle not lying on the sides of the triangle and lines in the plane of the triangle not passing through the vertices of the triangle.

plural of polarity item

(linguistics) A lexical item that can appear only in environments associated with a particular grammatical polarity.

(quantum field theory) One of a set of three spacelike (and possibly also one timelike) four-dimensional vectors which are orthonormal within some inertial reference frame.

plural of polarization vector