acid-fast
adjective
ac·id-fast
| \ ˈa-səd-ˌfast
\
\
Definition of acid-fast
: not easily decolorized by acids
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More Definitions for acid-fast
acid-fast
adjective
\ ˈas-əd-ˌfast
\
\
Medical Definition of acid-fast
: not easily decolorized by acids (as when stained)
—used especially of bacteria and tissues