hedge mustard

noun

: a plant of the genus Sisymbrium

especially : a stiffly branching Old World annual herb (S. officinale) with pale yellow flowers that is widely naturalized in North America and was formerly used in medicine as a diuretic and expectorant

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