black willow

noun

1

: any of several willows with dark bark

especially : an American tree (Salix nigra) with linear leaves that grows close to streams and lakes

2

: mule fat

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