Lagging definition

lăgĭng

Insulation used to prevent heat diffusion, as from a steam pipe.

noun

Thermal insulation for wrapping around pipes, boilers, etc.

noun

A wood framework to support an arch while it is being built.

noun

(mining) Planks or timber used to prevent rocks from falling in a shaft or drift.

noun

The covering of something with strips of felt, wood etc, either as insulation or for protection.

noun

A wooden frame built especially to support the sides of an arch until the keystone is positioned.

noun

Falling behind, not keeping up the pace.

adjective

Occurring after; indicating the later phase of.

adjective

The material so used.

noun

Present participle of lag.

verb

Other Word Forms

Singular:

lagging

Plural:

laggings

From lag

From American Heritage Dictionary of the English Language, 5th Edition
from lag

From Wiktionary