acid-fast

[as-id-fast, -fahst]

ac·id-fast

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

Origin:
1900–05

ac·id-fast·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Acid-fast is always a great word to know.
So is zedonk. Does it mean:
a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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