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phosphorus pentoxide
phos·pho·rus pent·ox·ide or phos·pho·rus ox·ide


noun 
Definition:
 
flammable hygroscopic white solid: a flammable white solid that absorbs moisture from the air. Source: burning phosphorus in air. Use: manufacture of phosphoric acid. P2O5
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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