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The Collaborative International Dictionary
Suillage

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.

Wiktionary
suillage

n. (context obsolete English) A drain or collection of filth.