acid-fastness

Questions

What does acid-fastness mean?

The state of being acid-fast.

Where does acid-fastness come from?

From acid-fast + -ness.

How to pronounce acid-fastness

1. Open the pronunciation page — Open the Speakur entry for “acid-fastness”.
2. Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
3. Play the audio — Click Play to hear reference audio for “acid-fastness”.
4. Repeat and practice — Say “acid-fastness” aloud, matching stress and vowels until it feels natural.