The industrial process of removing lime or calcium compounds from material, particularly in leather tanning where it's a critical step between liming and tanning.
From delime (de- + lime) + -ing (gerund/present participle). Became a standard technical term in leather manufacturing by the 19th century, describing one of the essential chemical steps.
Deliming is chemistry in action—after lime dissolves hair off a hide, the hide stays swollen and bitter. Deliming shrinks it back and neutralizes the pH so the actual tanning chemicals can work. Skip this step and your leather fails.
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