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Not decolorized by acid after staining, as bacteria that retain dye after an acid rinse.

ac′id-fast′ness n.


(Microbiology) (of bacteria and tissues) resistant to decolorization by mineral acids after staining


resistant to decolorizing by acidified alcohol after staining.
ac′id-fast`ness, n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.acid-fast - not easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis)
imperviable, impervious - not admitting of passage or capable of being affected; "a material impervious to water"; "someone impervious to argument"
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References in periodicals archive ?
However, special stains for fungi and acid fast bacilli were negative.
Bronchial alveolar lavage showed 90% lymphocytes and 10% macrophages in alveolar lining fluid, with negative smear and culture for acid fast bacilli (mycobacteria) and fungi.
CT guided biopsy of an index lung lesion stained positive for acid fast bacilli with caseating granulomas, which was diagnosed Mycobacterium avium intracellulare (MAI) complex.