noun Chemistry.
a salt or ester of orthophosphoric acid, or any compound containing the trivalent group −PO 4 .

1855–60; ortho- + phosphate

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World English Dictionary
orthophosphate (ˌɔːθəʊˈfɒsfeɪt)
any salt or ester of orthophosphoric acid

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Example sentences
The total orthophosphate test is largely a measure of orthophosphate.
Orthophosphate can interact with other cations such as calcium or magnesium which may be present in the water.
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