Definition of acid-fast in English:

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acid-fast

Entry from British & World English dictionary

adjective

Microbiology
Denoting bacteria that cannot be decolorized by an acid after staining, which is characteristic of the mycobacteria that cause tuberculosis and leprosy.
Example sentences
  • Special stains were negative for acid-fast bacilli, fungal forms, Pneumocystis, and other bacteria.
  • Cultures of right and left lung tissues were obtained for bacteria, acid-fast bacilli, and fungi.
  • Special stains for fungus and acid-fast bacteria are negative, although culture is the more definitive diagnostic test.

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