large river in northern Italy, from Latin Padus, a name of Celtic origin.

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Definitions of Po from WordNet
po (n.)
a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army;
Synonyms: petty officer / P.O.
po (n.)
an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States;
Synonyms: United States Post Office / US Post Office / Post Office
Po (n.)
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: polonium / atomic number "
Po (n.)
a European river; flows into the Adriatic Sea;
Synonyms: Po River