acid–fast

play
adjective ac·id–fast \ˈa-səd-ˌfast\

Definition of acid–fast

  1. :  not easily decolorized by acids

1903

First Known Use of acid–fast

1903


Medical Dictionary

acid–fast

play
adjective ac·id–fast \ˈas-əd-ˌfast\

Medical Definition of acid–fast

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

Learn More about acid–fast


Seen and Heard

What made you want to look up acid–fast? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

the point at which something begins

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • istock-refers-to-this-as-a-tumble-of-strawberries-which-sounded-pretty-nice-to-us
  • Which is a synonym of garner?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!