Hess image

noun

ˈhes-

: a third positive afterimage in a succession of visual afterimages resulting from a brief light stimulus

Word History

Etymology

after Carl von Hess †1923 German ophthalmologist

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