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Persistent emission of light following exposure to and removal of incident radiation.
(noun)
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Emission of light without burning or by very slow burning without appreciable heat, as from the slow oxidation of phosphorous: "He saw the phosphorescence of the Gulf weed in the water” ( Ernest Hemingway).
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.