synthetic iron oxide

noun

: a pigment that is produced from an iron salt (such as copperas) by precipitation or calcination under controlled conditions and is often purer than natural iron oxides

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now