ulcer disease

noun

: a common and destructive bacterial disease of young trout especially in hatcheries that is characterized by extensive skin lesions and sloughing ulcerations and is distinguished with difficulty from furunculosis

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