brown bast

noun

: a physiological disease of the Para rubber tree characterized by a grayish brown or greenish brown discoloration of the inner bark near the tapping cut and a stoppage in the flow of latex

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