Waterhouse stop

noun

: any one of a set of thin metal plates that each have a round or specially shaped hole corresponding to a particular photographic lens aperture and are inserted as required into a slot in the barrel of a lens especially for use in photoengraving

Word History

Etymology

after Major J. Waterhouse, 19th century British photochemist

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