gage block

noun

: a hardened steel block that is used by machinists for extremely accurate measurement and has two opposite surfaces ground and lapped plane and parallel to a thickness within a few millionths of an inch of its designated size and usually forms one of a graduated set of which two or more are often used in combination

called also precision block, size block

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