(Histology) Not easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis).
imperviable · impervious
acicular · acicularly · acid · acidaemia · Acid burned his hands. · acid criticism · acid drops · acidemia · acid-fast · Acid has eaten into this metal. · acid house · acidic · acidification · acidify · acidimeter · acidimetric