thematic vowel

noun

: a vowel ending the stem of a noun or verb but not belonging to the root

especially : the varying e:o (as in Latin nominative servos, vocative serve slave) compare grade sense 4

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