Other examples can be found (cited from publications such as the New York Times, National Geographic, Scientific American and The Telegraph) in grammarist.com under the entry for ???phosphorous???phosphorus???, which notes: ???Phosphorous is so often used as a noun that examples of its use as an adjective are hard to find.???D Snodin FRSCBristol, UK Peter Pauson (1925???2013)From William KerrOn 10