The Collaborative International Dictionary of English v.0.48:

Chimney \Chim"ney\, n.; pl. Chimneys. [F. chemin['e]e, LL.
   caminata, fr. L. caminus furnace, fireplace, Gr. ? furnace,
   oven.]
   1. A fireplace or hearth. [Obs.] --Sir W. Raleigh.
      [1913 Webster]

   2. That part of a building which contains the smoke flues;
      esp. an upright tube or flue of brick or stone, in most
      cases extending through or above the roof of the building.
      Often used instead of chimney shaft.
      [1913 Webster]

            Hard by a cottage chimney smokes.     --Milton.
      [1913 Webster]

   3. A tube usually of glass, placed around a flame, as of a
      lamp, to create a draft, and promote combustion.
      [1913 Webster]

   4. (Min.) A body of ore, usually of elongated form, extending
      downward in a vein. --Raymond.
      [1913 Webster]

   Chimney board, a board or screen used to close a fireplace;
      a fireboard.

   Chimney cap, a device to improve the draught of a chimney,
      by presenting an exit aperture always to leeward.

   Chimney corner, the space between the sides of the
      fireplace and the fire; hence, the fireside.

   Chimney hook, a hook for holding pats and kettles over a
      fire,

   Chimney money, hearth money, a duty formerly paid in
      England for each chimney.

   Chimney pot (Arch.), a cylinder of earthenware or sheet
      metal placed at the top of a chimney which rises above the
      roof.

   Chimney swallow. (Zool.)
      (a) An American swift (Ch[ae]ture pelasgica) which lives
          in chimneys.
      (b) In England, the common swallow (Hirundo rustica).

   Chimney sweep, Chimney sweeper, one who cleans chimneys
      of soot; esp. a boy who climbs the flue, and brushes off
      the soot.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chimney
    n 1: a vertical flue that provides a path through which smoke
         from a fire is carried away through the wall or roof of a
         building
    2: a glass flue surrounding the wick of an oil lamp [syn: lamp
       chimney, chimney]

Moby Thesaurus II by Grady Ward, 1.0:

106 Moby Thesaurus words for "chimney":
   abysm, abyss, arroyo, box canyon, breach, break, canyon, cavity,
   chap, chasm, check, chimney corner, chink, chute, cleft, cleuch,
   clough, col, coulee, couloir, country rock, crack, cranny,
   crevasse, crevice, cut, cwm, defile, dell, deposit, dike, ditch,
   donga, draw, excavation, fault, fender, fire screen, fireboard,
   fireguard, fireplace, fireside, fissure, flaw, flue, flue pipe,
   flume, fracture, fumarole, funnel, furrow, gangue, gap, gape, gash,
   gorge, groove, gulch, gulf, gully, hearth, hearthstone, hob, hole,
   hub, incision, ingle, inglenook, ingleside, joint, kloof, leak,
   lode, lodestuff, matrix, mineral deposit, moat, notch, nullah,
   opening, ore bed, pass, passage, pay dirt, ravine, rent, rift,
   rime, rupture, scissure, seam, shoot, slit, slot, smokehole,
   smokeshaft, smokestack, split, stack, stock, stovepipe, trench,
   valley, vein, void, wadi