acid-fast
adjective
ac·id-fast ˈa-səd-ˌfast 
: not easily decolorized by acids
Word History
First Known Use
1903, in the meaning defined above
Medical Definition
acid-fast
adjective
ˈas-əd-ˌfast
: not easily decolorized by acids (as when stained) —used especially of bacteria and tissues
- diambic
- diambs
- diameter
- diameter tape
- diameters
- diametral
- diametral curve
- diametral pitch
- diametral plane
- diametral surface
- diametric
- diametrical
- diametrically
- diametrically opposed to
- diametrically opposite
- diamide
- diamides
- diamido-
- diamine
- diamine black BH
- diamine dye
- diamines
- diaminogen
- diamins
- diammonium