Definitions

from The Century Dictionary.

  • noun A hollow horizontal septum in the furnace of a steam-boiler, which, being filled with water, forms a sort of water-bridge, under and over which the flame of the fuel is caused to pass.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Steam Boilers) A vertical water space in a fire box or combustion chamber.
  • noun (Mining) A support for the center of a tunnel.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A vertical water space in a firebox or combustion chamber within a steam boiler.
  • noun mining A support for the centre of a tunnel.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

mid- +‎ feather

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