| phosphorescence |
a fluorescence that persists after the bombarding radiation has ceased
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| phosphorous acid |
hypophosphorous acid: a clear or yellow monobasic acid (H3PO2)
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| phosphorus |
a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms morning star: a planet (usually Venus) seen just before sunrise in the eastern sky
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| phosgene |
a colorless poisonous gas that smells like new-mown hay; used in chemical warfare
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| phosphatase |
any of a group of enzymes that act as a catalyst in the hydrolysis of organic phosphates
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