firebrick

from WordNet (r) 3.0 (2006)

firebrick
    n 1: brick made of fire clay; used for lining e.g. furnaces and
         chimneys

from The Collaborative International Dictionary of English v.0.48

firebrick \firebrick\ n.
   a brick made of fire clay, used for lining e.g. furnaces and
   chimneys.
   [WordNet 1.5]

from U.S. Gazetteer (1990)

Firebrick, KY
  Zip code(s): 41137

from Moby Thesaurus II by Grady Ward, 1.0

44 Moby Thesaurus words for "firebrick":
      adobe, ashlar, biscuit, bisque, bowl, brick, bricks and mortar,
      cement, ceramic ware, ceramics, china, clinker, concrete,
      covering materials, crock, crockery, enamelware, ferroconcrete,
      flag, flagstone, flooring, glass, jug, lath and plaster, masonry,
      mortar, pavement, paving, paving material, plasters, porcelain,
      pot, pottery, prestressed concrete, refractory, roofage, roofing,
      siding, stone, tile, tiling, urn, vase, walling