Deuterostomia

plural noun
Deu·​ter·​o·​sto·​mia

Definition of Deuterostomia

in many classifications
: a major division of the animal kingdom comprising all bilateral animals (such as the chordates) that lack ectomesoderm and have indeterminate cleavage and a mouth that does not arise from the blastopore

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!

History and Etymology for Deuterostomia

New Latin, from deuter- entry 1 + -stomia

Keep scrolling for more

Learn More about Deuterostomia

Statistics for Deuterostomia

Cite this Entry

“Deuterostomia.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/Deuterostomia. Accessed 6 December 2019.

Comments on Deuterostomia

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

WORD OF THE DAY

very cautious or careful

Get Word of the Day daily email!

Test Your Vocabulary

Semantic Drift Quiz

  • a twisty river
  • Which of the following was once a synonym for fun?
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!