Princeton's WordNet

1. polonium, Po, atomic number 84(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

2. petty officer, PO, P.O.(noun)

   a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army

3. Po, Po River(noun)

   a European river; flows into the Adriatic Sea

4. United States Post Office, US Post Office, Post Office, PO(noun)

   an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States

Wiktionary

1. Po(ProperNoun)

   Italy's longest river, which flows 652 kilometers eastward to the Adriatic Sea near Venice.

2. po(Adjective)

   Shortened form of poor.

3. po(Noun)

   Plural form of poi.

The Nuttall Encyclopedia

1. Po

   the largest river in Italy, rises 6000 ft. above sea-level in the Cottian Alps, and after 20 m. of rocky defiles emerges on the great Lombardy plain, which it crosses from W. to E., receiving the Ticino, Adda, Mincio, and Trebbia, tributaries, and enters the Adriatic by a rapidly growing delta. Its total course is 360 m.; the width and volume of its stream make it difficult to cross and so a protection to all Italy. The chief towns on its banks are Turin, Piacenza, and Cremona.

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