po meaning and definition

PO noun

Definition of Po (noun)

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