Acid-fast meaning

ăsĭd-făst
Not decolorized by acid after staining, as bacteria that retain dye after an acid rinse.
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That does not readily lose its color when exposed to acids after being stained: said esp. of certain bacteria and tissues.
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Not decolorized by acid after staining, as bacteria that retain dye after an acid rinse.
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(histology, of bacteria) Retaining stain when treated with an acidic solution.
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