Source : Webster's Revised Unabridged Dictionary (1913)

Bosh \Bosh\, n.; pl. {Boshes}. [Cf. G. b["o]schung a slope.]
   1. One of the sloping sides of the lower part of a blast
      furnace; also, one of the hollow iron or brick sides of
      the bed of a puddling or boiling furnace.

   2. pl. The lower part of a blast furnace, which slopes
      inward, or the widest space at the top of this part.

   3. In forging and smelting, a trough in which tools and
      ingots are cooled.