(chemistry) A covalent bond in which the electrons are not shared equally, giving the bond some ionic character

(meteorology) A relatively rare type of clouds that occurs high in the stratosphere; polar stratospheric clouds often resemble mother-of-pearl as they shine in vivid colours, known as irisation

(engineering) A measure of a body's resistance to twisting; a measure of torsional strength.

plural of polar covalent bond

plural of space polar coordinate

plural of polar moment of inertia

The Southern Ocean.

Alternative form of South Polar Ocean.

(political science, US) the process of steady growth of the mutual dislike between Republicans and Democrats since the 1970s

plural of polar stratospheric cloud