·p.pr. & ·vb.n. of Lag.
II. Lagging ·noun Lags, collectively; narrow planks extending from one rib to another in the centering of arches.
III. Lagging ·noun 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.