staining

Noun

• (histology) the use of a dye to color specimens for microscopic study
• the act of spotting or staining something

Verb

• color with a liquid dye or tint
• produce or leave stains
• make dirty or spotty, as by exposure to air; also used metaphorically
• color for microscopic study
• present participle and gerund of stain

Synonyms

defile, maculate, maculation, spotting, stain, sully, tarnish