po

Noun

• an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States

• a European river; flows into the Adriatic Sea

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

• 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

Related words

• Synonyms: 
  United States Post Office , US Post Office , Post Office , PO , Po , Po River , petty officer , P.O. , polonium , atomic number 84