What does deacidify mean?
Deacidify is a technical verb meaning to remove acid from a substance or to reduce its acidity. It is most commonly encountered in conservation and library science, where acidic paper becomes brittle and yellow over time, and treatments that deacidify documents help preserve them for future generations. The word also appears in agriculture and environmental science: farmers may deacidify soil by adding lime, while engineers may deacidify water or industrial materials to prevent corrosion or meet safety standards. Formed from the prefix de-, indicating removal or reversal, plus acidify, it carries a precise, scientific register rather than a colloquial one. Its noun form is deacidification, referring to the treatment itself. Though not part of everyday speech, deacidify is a valuable term wherever controlling acidity is essential to preservation, safety, or productivity.
verbTo remove acid from something, or to reduce its acidity, as in treating paper, soil, water, or other materials to neutralize or lower their acid content.
- To remove acid from a material such as paper, reducing its acidity in order to preserve it.
- To treat soil, water, or another substance so as to lower or neutralize its acidity.
"Conservators deacidify brittle nineteenth-century books to slow their deterioration."
"The archive invested in equipment to deacidify thousands of endangered manuscripts."
"Farmers often deacidify overly acidic soil by applying agricultural lime before planting."
The pages of old books literally eat themselves — and librarians fight back with a process called deacidification.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of deacidify
Deacidify was formed in English from the prefix de- (from Latin, indicating reversal or removal) combined with the verb acidify, which derives from acid and ultimately from Latin acidus, meaning sour. The compound arose alongside related terms like deacidification as modern chemistry and conservation science developed in the nineteenth and twentieth centuries. It shares its Latin root acidus with words such as acidic, acidity, and acid itself.
Related word forms
How deacidify is actually used
Deacidify is a technical term used mainly in conservation, chemistry, agriculture, and environmental science; it is rare in everyday conversation.
Easily confused with deacidify
Acidify means to make something more acidic, while deacidify means the opposite — to remove or reduce acidity.