acid-free

adjective

Alkaline or neutral; not acidic.

“an acid-free soil”

OriginOld English frēo ← Proto-West Germanic *friu ← Proto-Germanic *frijwaz →
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Meanings

adjectiveacid-free (comparative more acid-free, superlative most acid-free)

comparative more acid-free · superlative most acid-free

  1. Alkaline or neutral; not acidic.

    an acid-free soil

    1 more example

    Printed on acid-free paper.

  2. Without using acid.

    an acid-free etching technique

Synonyms & antonyms

Also see
acidless

Origin

  1. Latinacidu
  2. Frenchacide
  3. Englishacid
  4. Proto-Indo-European*preyH-
  5. Proto-Indo-European*priHós
  6. Proto-Germanic*frijwaz
  7. Proto-West Germanic*friu
  8. Old Englishfrēo
  9. Englishacid-free

From acid + -free.

Full word history & related roots →

Translations

German säurefrei
  • säurefreiTranslations
Māori waikawakore
  • waikawakoreTranslations
Cite this entry
APA

acid-free. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/acid-free

MLA

“acid-free.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/acid-free. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “acid-free,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/acid-free.

Source: acid-free on Wiktionary, CC BY-SA 4.0.