Definitions

1. noun

A substance or a dye that changes color in response to a change in pH; a substance that exhibits a change of color with a change in the acidity or alkalinity of the environment.

“The scientist studied the properties of metachromes to better understand their applications in chemistry.”

2. noun

In cytology, a substance that stains certain parts of cells differently from others, often used in histology to reveal the structure and composition of tissues.

“The pathologist used metachromes to examine the tissue samples under a microscope.”