acid fast


[as-id-fast, -fahst]
resistant to decolorizing by acidified alcohol after staining.


acid-fastness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
(of bacteria and tissues) resistant to decolorization by mineral acids after staining

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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.
The American Heritage® Stedman's Medical Dictionary
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