HyperDic: acid-fast

English > 1 sense of the word acid-fast:
ADJECTIVEallacid-fastnot easily decolorized by acid solutions
English > acid-fast: 1 sense > adjective 1
Meaningnot easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis).
Broaderimpervious, imperviablenot admitting of passage / passage or capable of being affected

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