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.
Sorry, no etymologies found.