Definitions

1. adjective

Relating to or resembling the planet Mercury, especially in its rapid or erratic movements.

“The mercurous nature of the stock market made many investors nervous.”

2. adjective

Containing mercury or having the properties of mercury.

“The mercurous compound was used in ancient medical treatments.”

3. noun

A salt or compound containing mercury, especially one derived from mercuric oxide.

“Mercurous chloride was used in the past as a disinfectant.”