Search Result for "p.o.": 
Wordnet 3.0

NOUN (1)

1. a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army;
[syn: petty officer, PO, P.O.]



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]


WordNet (r) 3.0 (2006):

P.O.
    n 1: a noncommissioned officer in the Navy or Coast Guard with a
         rank comparable to sergeant in the Army [syn: petty
         officer, PO, P.O.]