protorosaur

noun

pro·​to·​ro·​saur

ˈprōtərəˌsȯ(ə)r

variants or protorosaurian

ˌ⸗⸗⸗ˈsȯrēən

or less commonly proterosaur

ˈ⸗⸗⸗ˌsȯ(ə)r

plural -s

: a reptile or fossil of the order Protorosauria

Word History

Etymology

New Latin Protorosauria

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