Definitions

1. noun

Latin for iron, especially metallic iron.

“The ancient Romans used ferrum to forge tools and armor.”

2. noun

In alchemy, a substance that represents iron in a series of symbolic transformations.

“In the alchemical process, ferrum was often associated with the planet Mars.”

3. noun

A symbol in astrology representing the planet Mars and the sign of Aries.

“Ferrum is a symbol used in some astrological charts to represent the planet Mars.”