\Sul"lage\, n. [Cf. {Suillage}, {Sulliage}.]
1. Drainage of filth; filth collected from the street or
   highway; sewage. [Obs.]
         The streets were exceedingly large, well paved,
         having many vaults and conveyances under them for
         sullage.                              --Evelyn.
2. That which sullies or defiles. [Obs.]
         It is the privilege of the celestial luminaries to
         receive no tincture, sullage, or difilement from the
         most noisome sinks and dunghills here below.
                                               --South.
3. (Founding) The scoria on the surface of molten metal in
   the ladle.
4. (Hydraul. Engin.) Silt; mud deposited by water.
{Sullage piece} (Founding), the sprue of a casting. See
   {Sprue}, n., 1
   (b) .