“Phosphorous” or “Phosphorus”—Which to use?

Definitions

What each term means

Same sound, different spellings and meanings, shown with a pronunciation guide for each term.

nouna multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms.

Usage

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…number of necessary nutrients—including nitrogen, phosphorus, potassium and iron—from the substrate…
…are KREEP (potassium, rare-earth elements, phosphorus) materials, anorthosites, recrystallized norite, or…
…calcium, cholesterol, creatinine, glucose, inorganic phosphorus, proteins, and uric acid in…
…possible army use of white phosphorus munitions.
…treatment plants performing enhanced biological phosphorus removal (EBPR) and is a…
Its high phosphorus content can be identified in
…no evidence that arsenic replaces phosphorus in DNA or RNA.
…than KREEP (potassium, rare-earth elements, phosphorus) materials, included anorthosite, and recrystallized…
…(hitherto too heavily contaminated by phosphorus) and the Derwent Valley's geographical…
It is also the phosphorus analogue of gasparite-(La).

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