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phosphoresce
phosphorescence
phosphoric
phosphoric acid
phosphorism
phosphorite
phosphorolysis
phosphorous
phosphorous acid
phosphorus
phosphorus pentoxide
phosphoryl
phosphorylase
phosphorylate
phot
phot-
photic
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phosphorous acid

phos·pho·rous ac·id


noun 
Definition:
 
1. white or yellowish crystalline solid: a white or yellowish crystalline solid that absorbs water from the atmosphere. Use: reducing agent, production of phosphite salts. H3PO3

2. dibasic acid formed from phosphorus pentoxide: an acid of a group formed by the combination of phosphorus pentoxide with water, each acid having one less oxygen atom than the corresponding phosphoric acid

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