acidfast

acid-fast

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

Origin:
1900–05

acid-fastness, noun
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Collins
World English Dictionary
acid-fast
 
adj
(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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