heart cockle

noun

: cockle entry 2 sense 1a

especially : a widely distributed burrowing cockle (Isocardia cor) with the umbones well separated giving the shell a heart-shaped appearance

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