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