Acid-fast Definition

ăsĭd-făst
adjective
That does not readily lose its color when exposed to acids after being stained: said esp. of certain bacteria and tissues.
Webster's New World
Not decolorized by acid after staining, as bacteria that retain dye after an acid rinse.
American Heritage Medicine

(histology, of bacteria) Retaining stain when treated with an acidic solution.

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