1 acid-fast | Definition of acid-fast

acid-fast

adjective
ac·​id-fast | \ ˈa-sÉ™d-ËŒfast How to pronounce acid-fast (audio) \

Definition of acid-fast

: not easily decolorized by acids

First Known Use of acid-fast

1903, in the meaning defined above

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More Definitions for acid-fast

acid-fast

adjective
\ ˈas-əd-ˌfast How to pronounce acid-fast (audio) \

Medical Definition of acid-fast

: not easily decolorized by acids (as when stained) used especially of bacteria and tissues

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Rhyming Dictionary: Words that rhyme with acid-fast