Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

Thelodontidae

plural noun
Thel·​o·​don·​ti·​dae | \ ˌtheləˈdäntəˌdē\

Definition of Thelodontidae

: a family of Devonian and Silurian ostracoderms that is included among the Heterostraci or isolated in the order Coelolepida

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 Thelodontidae

New Latin, from Thelodont-, Thelodus, type genus + -idae

Keep scrolling for more

Learn More about Thelodontidae

Statistics for Thelodontidae

Look-up Popularity

Comments on Thelodontidae

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

Show Comments  Hide Comments 

WORD OF THE DAY

resurrection

Listen to the pronounciation of resurrection

an act or instance of returning to life

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

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!

Words at Play
Ask the Editors
Word Games