acid-fast definition

  • adjective:
    • maybe not decolorized by acid after staining, as germs that retain dye after an acid rinse.
    • Retaining stain when treated with an acidic solution.
    • maybe not quickly decolorized by acidic solutions; concerns micro-organisms (especially the tubercle bacillus that causes tuberculosis)
  • others:
    • A literal interpretation of this German “säurfest”: placed on a course of germs which, when as soon as stained with basic aniline dyes, tenaciously keep the dye on subsequent contact with acids or alcoholic beverages.

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