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Not decolorized by acid after staining, as bacteria that retain dye after an acid rinse.
(Microbiology) (of bacteria and tissues) resistant to decolorization by mineral acids after staining
resistant to decolorizing by acidified alcohol after staining.
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|Adj.||1.||acid-fast - not easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis)|