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ozonize to treat, combine, or saturate with ozone. [2 definitions]
ozonosphere see ozone layer.
P1 abbreviation of "passing," completed successfully. [2 definitions]
P2 symbol of the chemical element phosphorus.
P- in the U.S. military, a pursuit plane, such as a P-38 or P-40.
p the sixteenth letter of the English alphabet. [3 definitions]
p. abbreviation of "page," one side of a sheet of printed or written paper. [2 definitions]
PA1 abbreviation of "Pennsylvania," an eastern U.S. state south of New York.
Pa symbol of the chemical element protactinium.
PA2 abbreviation of "public address."
pa (informal) father; papa.
pa'anga the chief monetary unit of Tonga, equaling one hundred seniti.
Pablo Picasso a Spanish painter and sculptor (b.1881--d.1973).
Pablum trademark for a smooth, bland baby cereal. [2 definitions]
pabulum a soft substance that serves to nourish. [2 definitions]
PAC abbreviation of "political action committee."
pac an insulated, waterproof boot designed for wear in extreme cold. [3 definitions]
pace1 the length of one stride in walking. [12 definitions]
pace2 with the permission of (used to disagree politely).
pacemaker a small electronic device implanted under the skin to regulate the heart rate in patients with heart problems. [3 definitions]
pacer a horse that paces in harness racing. [2 definitions]