say it: LAG-ing
lagging is a noun meaning "insulation used to wrap around pipes or boilers or laid in attics to prevent loss of heat". It carries one recorded sense.
insulation used to wrap around pipes or boilers or laid in attics to prevent loss of heat
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for lagging come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.