ALL meanings of acid-fast
ac·id-fast
A a - adjective acid-fast (of bacteria and tissues) resistant to decolorization by mineral acids after staining 3
- adjective acid-fast that does not readily lose its color when exposed to acids after being stained: said esp. of certain bacteria and tissues 3
- adjective acid-fast resistant to decolorizing by acidified alcohol after staining. 1
- adjective acid-fast (histology) (of bacteria) Retaining stain when treated with an acidic solution. 0