What is "cleading"

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.

2. Lags, collectively; narrow planks extending from one rib to another in the centering of arches.

n. 1 A jacket or outer covering to prevent radiation of heat, as from the boiler, cylinder, etc. of a steam engine. 2 The planking or boarding of a shaft, cofferdam, etc.