acid-fast
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.ac·id–fast
adjective \ˈa-səd-ˌfast\Definition of ACID-FAST
: not easily decolorized by acids
See First Known Use of ACID-FAST
1903
acid–fast
adjective \ˈas-əd-ˌfast\ (Medical Dictionary)Medical Definition of ACID–FAST
: not easily decolorized by acids (as when stained)—used especially of bacteria and tissues
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