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Definition of phosphorus noun from the Oxford Advanced American Dictionary

 

phosphorus

 noun
noun
NAmE//ˈfɑsfərəs//
 
[uncountable] (symbol P)
 
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a chemical element. Phosphorus is found in several different forms, including as a poisonous, pale yellow substance that shines in the dark and starts to burn as soon as it is placed in air.
See the Oxford Advanced Learner's Dictionary entry: phosphorus