Where does this definition of acid-fast come from?
This entry for acid-fast is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is acid-fast a noun, verb, or something else?
In this entry, acid-fast is tagged as 2adj..
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.