Acid-fast

adj

adj ·Rare ·Advanced level

Definitions

Adjective
  1. 1
    Retaining stain when treated with an acidic solution.
Adjective
  1. 1
    not easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis) wordnet

Related phrases

acid-fast bacillus

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.