Definition of "sphenodon" []

• See tuatara. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Many years later euryapsids had vanished into the lepidosaurs sphenodon, snakes and lizards-all diapsids as a secondary change, and then there was the term “sauropsid” which I saw for the 1st time at AMNH which gathered together all non synapsids and non turtles."