plural noun

Definition of Palaeechinoidea

in some classifications
: a division of extinct chiefly Paleozoic sea urchins having the test usually composed of more than 20 meridional rows of plates that often overlap and jaws always present — compare euechinoidea

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Other Words from Palaeechinoidea

palaeechinoidean \ ¦⸗⸗+ \ adjective or noun

History and Etymology for Palaeechinoidea

New Latin, from pale- + Echinoidea

Keep scrolling for more

Learn More about Palaeechinoidea

Statistics for Palaeechinoidea

Cite this Entry

“Palaeechinoidea.” Dictionary, Merriam-Webster, Accessed 16 Apr. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Comments on Palaeechinoidea

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


Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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