seaside arrowgrass

noun

: a grassy perennial herb (Triglochin maritima) found in salt marshes throughout cooler regions in the north temperate zone and having an erect slender spike of small greenish white flowers

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