Suillage

from The Collaborative International Dictionary of English v.0.48

Suillage \Su"il*lage\, n. [OF. souillage, soillage, fr.
   souiller, soiller. See {Soil} to stain, and cf. {Sullage}.]
   A drain or collection of filth. [Obs.] [Written also
   {sulliage}, and {sullage}.] --Sir H. Wotton.
   [1913 Webster]