protorosaur

noun
pro·​to·​ro·​saur | \ˈprōtərəˌsȯ(ə)r\
variants: or protorosaurian \ˌ⸗⸗⸗ˈsȯrēən \ or less commonly proterosaur \ˈ⸗⸗⸗ˌsȯ(ə)r \
plural -s

Definition of protorosaur 

: a reptile or fossil of the order Protorosauria

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History and Etymology for protorosaur

New Latin Protorosauria

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