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from the GNU version of the Collaborative International Dictionary of English

  • n. a space filled with steam between an inner and an outer cylinder, or between a casing and a receptacle, as a kettle.
  • n. See under Jacket.

from The Century Dictionary and Cyclopedia

  • n. An inclosure adapted for receiving steam, and applying the heat of the steam to a kettle, tank, steam-cylinder, etc., surrounded by such inclosure.
  • To apply a steam-jacket to or surround with one; furnish with hollow walls within which hot dry steam may be circulated to supply heat: used of engine-cylinders, feed-water heaters, cookers, sterilizers, and other devices where heat is to be maintained against condensation, radiation, or other losses.


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