Definition

To apply a dye or stain to a specimen in order to enhance contrast and make certain features more visible under a microscope.

Example

The scientist decided to counterstain the cells to better observe their structures.

Tense Forms

Conversation

Did you remember to counterstain your slides for the lab tomorrow?

Oh no, I totally forgot about that!

It's really important, especially for the visibility of the cells.

Thanks for the reminder! I'll make sure to do it tonight.

Synonyms & Antonyms

Root Explanation

Counterstain → It is formed from "counter-" (meaning against) and "stain" (from Old French *esteindre*, meaning to extinguish or to dye). The word refers to a dye applied against the primary stain in microscopy or histology, providing contrast.

Memory Tip

Think of applying a dye 'against' ('counter-') the primary color to create contrast — that's what counterstain means.

Visually Confused Words