Hesperornithiformes

plural noun

Hes·​per·​or·​nith·​i·​for·​mes

ˌhespə(ˌ)rȯrˌnithəˈfȯrˌmēz

: an order of extinct aquatic birds (superorder Odontognathae) including the genus Hesperornis and related Cretaceous forms

Word History

Etymology

New Latin, from Hesperornith-, Hesperornis + -iformes

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