• The material, as cloth, felt, etc., from which a jacket is made.
  • A jacket; a cover or protection to an inanimate object, as the felt covering of a steam-pipe.
  • A thrashing.
  • Surrounding or protecting as a jacket: in <em>physical</em>, said of a layer of insulating material surrounding a calorimeter or other chamber to prevent the inflow or egress of heat.
  • The material of a jacket.
  • Present participle of <xref>jacket</xref>.
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