What does delime mean?
Delime is a technical verb meaning to remove lime — most often calcium carbonate scale — from equipment, water, hides, or processed materials. It arises wherever hard water leaves chalky deposits: boilers, kettles, coffee machines, and industrial heat exchangers all need periodic deliming to run efficiently, since accumulated scale insulates heating surfaces and narrows pipes. The word also has specialized senses in older trades: tanners delime hides after the unhairing stage to neutralize the lime used earlier in the process, and sugar refiners speak of deliming juice during clarification. Formed simply from the prefix de- ("remove") and the noun lime, it belongs to the same practical family as descale and decalcify. Though rarely heard in casual speech — homeowners tend to say "descale" instead — delime is the standard term in maintenance manuals, brewing, water treatment, and leather manufacturing, making it a precise and useful word for anyone writing about industrial upkeep or traditional crafts.
verbTo remove lime or calcium deposits from something, especially from equipment, water, hides, or industrial materials. It is chiefly a technical term in industries such as water treatment, brewing, tanning, and sugar refining.
- To remove calcium carbonate (limescale) deposits from machinery, pipes, or appliances such as kettles and coffee makers.
- To treat animal hides with a chemical bath that removes lime after the unhairing stage of tanning.
- In sugar refining, to remove excess lime from juice during clarification.
"The brewery shuts down each spring to descale and delime its heat exchangers."
"Run a vinegar solution through the machine once a month to delime it and keep the heating element efficient."
"After unhairing, the hides are delimed to neutralize the lime and prepare them for bating."
Behind almost every perfect cup of tea brewed in a hard-water city, an unglamorous little verb — delime — has quietly done its work.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of delime
Delime is a transparent English formation combining the Latinate prefix de- ("down, away, remove") with the native noun lime, which descends from Old English līm, meaning the sticky substance birdlime was made from and later calcium oxide. Lime itself traces back to Proto-Germanic *līmaz, cognate with Dutch lijm and German Leim, and distantly related to Latin limus ("mud, slime"), which also gives us the English word slime. The verb delime arose in technical and industrial usage, likely during the nineteenth century, as chemical processing industries needed a compact way to describe stripping lime from hides, juices, and machinery.
Related word forms
How delime is actually used
Delime is a technical, workmanlike term found mainly in trade manuals, maintenance guides, and industry documents rather than everyday conversation. In household contexts, speakers more often say "descale"; in tanneries and sugar mills, "delime" is the established professional term.
Easily confused with delime
"Decline" means to refuse or decrease and differs by just one letter; "delime" specifically means to strip away lime or mineral scale.