traveling microscope

noun

: a microscope provided with cross hairs and mounted in such a way that it can be moved along a base with a screw for the purpose of making accurate measurements of distance

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