Definitions

1. noun

A purple or reddish-brown dye or pigment, especially an iron oxide, used in painting and as a pigment for cosmetics.

“The artist mixed atrament with other colors to create a unique shade for the portrait.”

2. noun

A reddish-brown pigment, especially an iron oxide, used as a coloring agent in cosmetics and in medicine for treating certain skin conditions.

“The dermatologist applied a topical ointment containing atrament to soothe the patient’s rash.”