resistant to decolorizing by acidified alcohol after staining.
Historical Examples

The acid-fast bacteria are particularly rich in fatty substances, especially the higher wax-like fats.
The Fundamentals of Bacteriology Charles Bradfield Morrey

Other bacteria than the acid-fast group are stained blue by Gabbet’s method.
A Manual of Clinical Diagnosis James Campbell Todd

This method is supposed to differentiate between B. tuberculosis and other acid-fast micro-organisms.
The Elements of Bacteriological Technique John William Henry Eyre

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

acid-fast adj.
Of or relating to bacteria that are not decolorized by an acidic alcohol solution after they have been stained.
ac’id-fast’ness n.

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