roughing mill

noun

1

: a set of roughing rolls

2

: a revolving metal disk charged with an abrasive that is used in various processes (as the grinding of gems)

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