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]

	

	P.O.
     n : a noncommissioned officer in the navy with a rank comparable
         to sergeant in the army [syn: petty officer, PO]

	

	Po
     n 1: a radioactive metallic element that is similar to tellurium
          and bismuth; occurs in uranium ores but can be produced
          by bombarding bismuth with neutrons in a nuclear reactor
          [syn: polonium, atomic number 84]
     2: a noncommissioned officer in the navy with a rank comparable
        to sergeant in the army [syn: petty officer, P.O.]
     3: a European river; flows into the Adriatic Sea [syn: Po
        River]
     4: an independent agency of the federal government responsible
        for mail delivery (and sometimes telecommunications)
        between individuals and businesses in the United States
        [syn: United States Post Office, US Post Office, Post
        Office]