shell eye

noun

: any of numerous pigmented spots in the shell of chitons that are sensitive to light and to disturbances in the water and that sometimes develop a retina

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