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]

WordNet (r) 3.0 (2006):

Pus
    n 1: the tenth month of the Hindu calendar [syn: Pus, Pansa]
    2: a fluid product of inflammation [syn: pus, purulence,
       suppuration, ichor, sanies, festering]