DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Pus \Pus\, n. [L., akin to Gr. ?, ?, and to E. foul: cf. F. pus.
      See Foul, a.] (Med.)
      The yellowish white opaque creamy matter produced by the
      process of suppuration. It consists of innumerable white
      nucleated cells floating in a clear liquid.
      [1913 Webster]