The Collaborative International Dictionary of English v.0.48:

Scullery \Scul"ler*y\ (sk[u^]l"l[~e]r*[y^]), n.; pl.
   Sculleries (sk[u^]l"l[~e]r*[i^]z). [Probably originally, a
   place for washing dishes, and for swillery, fr. OE. swilen to
   wash, AS. swilian (see Swill to wash, to drink), but
   influenced either by Icel. skola, skyla, Dan. skylle, or by
   OF. escuelier a place for keeping dishes, fr. escuele a dish,
   F. ['e]cuelle, fr. L. scutella a salver, waiter (cf.
   Scuttle a basket); or perhaps the English word is
   immediately from the OF. escuelier; cf. OE. squyllare a
   dishwasher.]
   1. A place where dishes, kettles, and culinary utensils, are
      cleaned and kept; also, a room attached to the kitchen,
      where the coarse work is done; a back kitchen.
      [1913 Webster]

   2. Hence, refuse; filth; offal. [Obs.] --Gauden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

scullery
    n 1: a small room (in large old British houses) next to the
         kitchen; where kitchen utensils are cleaned and kept and
         other rough household jobs are done