geographic tongue

noun

: a condition in which the tongue exhibits smooth patches surrounded by slightly elevated grayish margins

called also wandering rash

Word History

Etymology

so called from the resemblance of the patches to land masses on a map

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