noun. a stain of contrasting color that is used when the principal stain does not show the structure clearly.
- counter- (English)
- stain (English)
- steinen (Middle English (1100-1500))
Example sentences of the word counterstain
1. Noun, singular or mass
Accordingly, the counterstain** colors the remaining peptidoglycan layer, resulting in a characteristic Gram-negative stain.