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From The Collaborative International Dictionary of English v.0.48:

Phosphoryl \Phos"phor*yl\ (f[o^]s"f[o^]r*[i^]l), n. [Phosphorus
   + -yl.] (Chem.)
   The radical PO, regarded as the typical nucleus of certain
   compounds.
   [1913 Webster]
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