Meanings
adjectiveacid-fast (comparative more acid-fast, superlative most acid-fast)
comparative more acid-fast · superlative most acid-fast
Synonyms & antonyms
adjectivenot easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis)
Similar
Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Translations
Irish aigéadobach
- aigéadobachretaining stain when treated with an acidic solution
Polish kwasooporny
- kwasoopornyretaining stain when treated with an acidic solution
Cite this entry
APA
acid-fast. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/acid-fast
MLA
“acid-fast.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/acid-fast. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “acid-fast,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/acid-fast.
Source: acid-fast on Wiktionary, CC BY-SA 4.0.