oystershell scale

noun

variants or less commonly oystershell bark louse

: an abundant widely distributed scale insect (Lepidosaphes ulmi) that infests and greatly injures various trees and shrubs see fig scale

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