phosphoric

[fos-fawr-ik, -for-]
adjective Chemistry.
of or containing phosphorus, especially in the pentavalent state.

Origin:
1775–85; phosphor- + -ic

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World English Dictionary
phosphoric (fɒsˈfɒrɪk)
 
adj
of or containing phosphorus in the pentavalent state

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

phosphoric phos·phor·ic (fŏs-fôr'ĭk)
adj.
Of, relating to, or containing phosphorus, especially with a valence of 5 or a valence higher than that of a comparable phosphorous compound.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
Producers add sulfuric acid to form phosphoric acid, which is later converted to ammonium phosphate.
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