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1. 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
   - polonium, atomic number 84
    
2. A European river; flows into the Adriatic Sea
   - Po River

1. An independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States
   - United States Post Office, US Post Office, Post Office
    
2. A noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army
   - petty officer, P.O.

Derived forms: Pos, POs

Type of: enlisted officer, independent agency, metal, metallic element, noncom, noncommissioned officer, river

Part of: Italia, Italian Republic, Italy

Encyclopedia: PO