blister pearl

noun

: a pearly excrescence on the inside of the shell of a mollusk (such as the oyster) commonly enclosing a foreign body (such as a bit of mud or a parasite)

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