Japanese walnut

noun

: a valuable Japanese nut tree (Juglans cordiformis ailanthifolia) that bears a heart-shaped nut and is used as a walnut stock because of its hardiness

called also heartnut, Japan walnut

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