electron telescope

noun

: an electron-optical instrument that penetrates obstacles to vision (such as fog, smoke, darkness, or distance) by means of infrared rays, the image being focused on a photosensitive cathode that in turn produces the final enlarged electron image on a fluorescent screen

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