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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| PAS | |
| —abbreviation for | |
| physician-assisted suicide: a practice in which a terminally-ill person requests a medical practitioner to administer a lethal dose of medication | |
| PA's | |
| —pl n | |
| mountaineering a type of rock boot | |
| [C20: named after Pierre Allain, French climber] | |
PA or P.A.
abbr.
physician's assistant
PAS or PASA
abbr.
para-aminosalicylic acid
periodic acid-Schiff
| protactinium (prō'tāk-tĭn'ē-əm) Pronunciation Key
Symbol Pa A rare, extremely toxic, radioactive metallic element of the actinide series that occurs in uranium ores. It has 13 known isotopes, the most stable of which is protactinium 231 with a half-life of 32,760 years. Atomic number 91; approximate melting point 1,550°C; specific gravity 15.37; valence 4, 5. See Periodic Table. |
PAS
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