| PON | a problem that severely tests the ability of an inexperienced person |
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| PON | a band of nerve fibers linking the medulla oblongata and the cerebellum with the midbrain |
| PON | a nonsteroidal anti-inflammatory and analgesic drug (trade name Ponstel) used to treat mild pain (especially menstrual cramps) |
| PON | a suspension bridge across the Tagus River at Lisbon |
| PON | pickerelweed |
| PON | American plant having spikes of blue flowers and growing in shallow water of streams and ponds |
| PON | aquatic or bog plants |
| PON | famous chief of the Ottawa who led an unsuccessful rebellion against the British (1715-1769) |
| PON | (ancient Rome) a member of the highest council of priests in ancient Rome |
| PON | the head of the Roman Catholic Church |
| PON | puffed up with vanity |
| PON | the government of the Roman Catholic Church |