Thecosomata

plural noun

The·​co·​so·​ma·​ta

ˌthēkəˈsōmətə

in some classifications

: a division of Pteropoda comprising pteropods with a shell compare gymnosomata

thecosomatous

-təs

adjective

Word History

Etymology

New Latin, from thec- + -somata

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