The Collaborative International Dictionary of English v.0.48:

Sanies \Sa"ni*es\, n. [L.] (Med.)
   A thin, serous fluid commonly discharged from ulcers or foul
   wounds.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sanies
    n 1: a fluid product of inflammation [syn: pus, purulence,
         suppuration, ichor, sanies, festering]