Ancyloceras

noun

An·​cy·​loc·​er·​as

ˌansəˈläsərəs

: a genus of ammonoids having a partly uncoiled shell and the aperture of the living chamber directed toward the coiled part

Word History

Etymology

New Latin, from ankyl- + -ceras

First Known Use

1842, in the meaning defined above

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