(linear algebra) Relative to a set S in Rⁿ, the set of points y such that the inner product of x and y is not positive for any point x in S.

plural of polar bear

A period of darkness that occurs in winter in polar regions north from the Arctic Circle and south from the Antarctic Circle, and during which the sun stays below the horizon.

(planetology) A high-latitude region of a celestial body that is covered by ice.

(mathematics) An equation defining a curve in terms of radius and angle.

(semantics) gradable antonym

(biology) One of the small cells that are by-products of the meiosis that forms an egg.

(linguistics) A question which has only two possible responses: yes (affirmative) or no (negative).

plural of polar question

plural of polar cone