The Collaborative International Dictionary of English v.0.48:

Sprout \Sprout\, n. [Cf. AS. sprote a sprout, sprig; akin to
   Icel. sproti, G. sprosse. See Sprout, v. i.]
   1. The shoot of a plant; a shoot from the seed, from the
      stump, or from the root or tuber, of a plant or tree; more
      rarely, a shoot from the stem of a plant, or the end of a
      branch.
      [1913 Webster]

   2. pl. Young coleworts; Brussels sprouts. --Johnson.
      [1913 Webster]

   Brussels sprouts (Bot.) See under Brussels.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Brussels \Brussels\ prop. n. (Geography)
   The capital city of Belgium. Population (2000) = 949,070
   (metro). It has given its name to a kind of carpet, a kind of
   lace, etc.
   [PJC]

   Brussels carpet, a kind of carpet made of worsted yarn
      fixed in a foundation web of strong linen thread. The
      worsted, which alone shows on the upper surface in drawn
      up in loops to form the pattern.

   Brussels ground, a name given to the handmade ground of
      real Brussels lace. It is very costly because of the
      extreme fineness of the threads.

   Brussels lace, an expensive kind of lace of several
      varieties, originally made in Brussels; as, Brussels
      point, Brussels ground, Brussels wire ground.

   Brussels net, an imitation of Brussels ground, made by
      machinery.

   Brussels point. See Point lace.

   Brussels sprouts (Bot.), a plant of the Cabbage family,
      which produces, in the axils of the upright stem, numerous
      small green heads, or "sprouts," each a cabbage in
      miniature, of one or two inches in diameter; the
      thousand-headed cabbage.

   Brussels wire ground, a ground for lace, made of silk, with
      meshes partly straight and partly arched.
      [1913 Webster]

WordNet (r) 3.0 (2006):

brussels sprouts
    n 1: the small edible cabbage-like buds growing along a stalk of
         the brussels sprout plant