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proterosaur

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protero·​saur | \ ˈprätərəˌsȯ(ə)r \

Definition of proterosaur

variant spelling of

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“Proterosaur.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/proterosaur. Accessed 18 January 2020.

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