spiralium

noun

spi·​ra·​li·​um

spīˈrālēəm

plural spiralia

-ēə

: one of the spirally twisted ribbonlike calcareous supports on the interior of the valve of various extinct brachiopods

Word History

Etymology

New Latin, from Medieval Latin spiralis spiral + New Latin -ium

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