pelycosaur

noun
pel·​y·​co·​saur | \ ˈpe-li-kə-ˌsȯr How to pronounce pelycosaur (audio) \

Definition of pelycosaur

: 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

First Known Use of pelycosaur

1884, in the meaning defined above

History and Etymology for pelycosaur

ultimately from Greek pelyc-, pelyx bowl + sauros lizard

Keep scrolling for more

Learn More about pelycosaur

Time Traveler for pelycosaur

Time Traveler

The first known use of pelycosaur was in 1884

See more words from the same year

Statistics for pelycosaur

Cite this Entry

“Pelycosaur.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pelycosaur. Accessed 30 Nov. 2020.

More from Merriam-Webster on pelycosaur

Britannica.com: Encyclopedia article about pelycosaur

Comments on pelycosaur

What made you want to look up pelycosaur? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

A Thanksgiving Word Quiz

  • a traditional thanksgiving dinner
  • November comes from a word for which of the following numbers?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!