pn. a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms pn. the 16th letter of the Roman alphabet p-n junctionn. the junction between a p-type semiconductor and an n-type semiconductor p-n-p transistorn. a junction transistor having an n-type semiconductor between a p-type semiconductor that serves as an emitter and a p-type semiconductor that serves as a collector p-type semiconductorn. a semiconductor in which electrical conduction is due chiefly to the movement of positive holes p. g. wodehousen. English writer known for his humorous novels and stories (1881-1975) p. p. von mausern. German arms manufacturer and inventor of a repeating rifle and pistol (1838-1914) p. t. barnumn. United States showman who popularized the circus (1810-1891) p.a.n. an electronic amplification system used as a communication system in public areas p.a.r. by the year; every year (usually with reference to a sum of money paid or received) p.a. systemn. an electronic amplification system used as a communication system in public areas p.e.n. the mechanical energy that a body has by virtue of its position; stored energy p.m.r. between noon and midnight p.m.s. after noon p.o.n. a noncommissioned officer in the navy with a rank comparable to sergeant in the army
