grass sponge

noun

: a brittle usually dark brown often very large inferior commercial sponge (Spongia graminea) occurring in the Gulf of Mexico, in the West Indies, and off the Florida coast

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