diamond plate

noun

1

: a steel plate spread with diamond dust and oil for rubbing down gems

2

: a diamond-shaped plate or strap in a ship forming a connection and brace for the flanges of two frames or beams where they cross

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