lagging

lagging
    n 1: used to wrap around pipes or boilers or laid in attics to
         prevent loss of heat
    

Lag \Lag\, v. i. [imp. & p. p. {Lagged}; p. pr. & vb. n.
   {Lagging}.]
   To walk or more slowly; to stay or fall behind; to linger or
   loiter. "I shall not lag behind." --Milton.

   Syn: To loiter; linger; saunter; delay; be tardy.
        [1913 Webster]
    

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]
    

70 Moby Thesaurus words for "lagging":
      Micawberish, afterthought, backward, bind, block, blockage,
      bureaucratic delay, dalliance, dallying, dawdling, delay, delayage,
      delayed reaction, delaying, detention, dilatoriness, dilatory,
      dillydallying, double take, dragging, easygoing, foot-dragging,
      halt, hang-up, hindrance, holdup, interim, jam, lackadaisical, lag,
      laggard, lax, lazy, lingering, logjam, loitering, lollygagging,
      moratorium, obstruction, paperasserie, pause, procrastinating,
      procrastination, procrastinative, procrastinatory, red tape,
      red-tapeism, red-tapery, remiss, reprieve, respite, retardance,
      retardation, shilly-shallying, shuffling, slack, slow, slow-up,
      slowdown, slowness, sluggish, stay, stay of execution, stop,
      stoppage, suspension, tarrying, tie-up, time lag, wait