(physics, chemistry) The electrode potential with reference to that of a normal hydrogen electrode

plural of North American porcupine

A species of New World porcupine, Erethizon dorsatum.

(logic) A way of expressing a formula of predicate logic such the formula consists of a prenex and a matrix, with the prenex preceding the matrix.

(mathematics) A norm of an ordinary Euclidean space, for which the Pythagorean theorem holds, defined by |x|=√

plural of Normandy pippin

A sun-dried apple for winter use.

A hamlet in Alberta, Canada

(geopolitics, derogatory) The North Atlantic Treaty Organization.

plural of North Walian