D defs.my
Entry 2 senses Webster, 1913

Lagging

/lăg'-ĭng/ · Lag·ging · IPA /lˈæɡɪŋ/
01 n. The clothing (esp., an outer, wooden covering), as of a steam cylinder, applied to prevent the radiation of heat; a covering of lags; -- ca…
  1. 1.
    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.(Mach.) Also: deading, cleading
  2. 2.
    Lags, collectively; narrow planks extending from one rib to another in the centering of arches.