Dictionary

acid-fast

acid–fast

adjective ac·id–fast \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

Browse

Next Word in the Dictionary: acid fogPrevious Word in the Dictionary: acid eggAll Words Near: acid-fast
March 03, 2015
thanatology Hear it
The study of death and grieving
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears