pelycosaur
noun
pel·y·co·saur
ˈpe-li-kə-ˌsȯr 
: any of an order (Pelycosauria) of extinct, primitive, synapsid vertebrates (such as dimetrodon) chiefly of the Permian period often having extreme development of the dorsal vertebral processes and giving rise to the therapsids
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“Pelycosaur.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pelycosaur. Accessed 30 Nov. 2024.
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