acid-fast [adjective]

Definition of acid-fast:

not easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis)

Synonyms of acid-fast:

● Acid-resistant

● Imperviable

● Impervious

● Acid-proof

● Acid resistant


Opposite/Antonyms of acid-fast:

● Pervious

● Permeable

● Receptive


Sentence/Example of acid-fast:

The acid-fast bacteria are particularly rich in fatty substances, especially the higher wax-like fats.