: a lag (see lag entry 4 sense 2) or material used for making lags: such as
a
: material for thermal insulation especially around a cylindrical object
b
: planking used especially for preventing cave-ins in earthwork or for supporting an arch during construction
Cite this Entry
“Lagging.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lagging. Accessed 2 Jul. 2025.
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