Meaning

noun a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor

noun a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army

noun a European river; flows into the Adriatic Sea

originFrom Middle English po (found also in pocock), from Old English pāwa, pēa (“peacock”), from Proto-Germanic *pāwô (“peacock”), from Latin pāvō. Cognate with Dutch pauw, German Pfau. See also peacock.

Etymology from Wiktionary, CC BY-SA 3.0