1. Po

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.
Synonyms
metal polonium metallic element atomic number 84
Etymology
Po (English)
Po (Italian)
Padus (Latin)

2. po-faced

adjective. Humorless and disapproving.
Synonyms
humourless unhumorous humorless
Antonyms
humorous funny comical farcical

3. PO

noun. A noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army.
Synonyms
PO enlisted officer SCPO noncom master-at-arms petty officer noncommissioned officer senior chief petty officer

4. PO

noun. 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 independent agency US Post Office

5. Po

noun. A European river; flows into the Adriatic Sea.
Synonyms
Italy Italian Republic Italia Po River
Antonyms
nonmetallic
Etymology
Po (English)
Po (Italian)
Padus (Latin)
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