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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