poss Meaning, Definition & Usage

1. 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
   atomic number 84; polonium; Po.
   
2. noun a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army
   petty officer; PO; P.O..
   
3. noun a European river; flows into the Adriatic Sea
   Po River; Po.
   
4. noun an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States
   PO; US Post Office; Post Office; United States Post Office.
   

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