lagging \lag"ging\, n.
   1. mach. the clothing esp., an outer, wooden covering, as
      of a steam cylinder, applied to prevent the radiation of
      heat; a covering of lags; -- called also deading and
      cleading.
      1913 webster

   2. lags, collectively; narrow planks extending from one rib
      to another in the centering of arches.
      1913 webster
see also:
deading cleading 

cleading \clead"ing\, n. scot., clothing. see cloth.
   1913 webster
   1. a jacket or outer covering of wood, etc., to prevent
      radiation of heat, as from the boiler, cylinder. etc., of
      a steam engine.
      1913 webster

   2. the planking or boarding of a shaft, cofferdam, etc.
      1913 webster
see also:
cloth