acid-fast


ac·id–fast

adjective \ˈa-səd-ˌfast\

Definition of ACID-FAST

:  not easily decolorized by acids

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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