meaning of lagging
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.
2. Lags, collectively; narrow planks extending from one rib to another in the centering of arches.
3. of Lag
4. used to wrap around pipes or boilers or laid in attics to prevent loss of heat