Definitions

from The Century Dictionary.

  • noun A pipe or duct used to convey hot air or steam from a furnace to the apartments of a house.

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

  • noun A pipe or duct used to convey hot air or steam.

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

  • noun A pipe or duct used, especially in ancient times, to convey hot air or steam for heating purposes.

Etymologies

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Examples

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