phosphyl
/ˈfɒsfʌɪl/ /ˈfɒsfɪl/Chemistry
noun
A radical or group (e.g. —PO2) containing a phosphorus atom bonded to at least two oxygen atoms, one or more of which may have organic substituents attached. Usually attributive.
Origin
Late 19th century; earliest use found in George M'Gowan (b. 1853). From phospho- + -yl.