plural noun
Mo·​nad·​i·​dae | \ məˈnadəˌdē \

Definition of Monadidae

: a family of free-living flagellates (order Protomonadina) that may be active or attached and that often form colonies

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 Monadidae

New Latin, from Monad-, Monas, type genus + -idae

Keep scrolling for more

Learn More about Monadidae

Statistics for Monadidae

Cite this Entry

“Monadidae.” The Dictionary, Merriam-Webster Inc., Accessed 19 January 2020.

Comments on Monadidae

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


to insert between existing elements

Get Word of the Day daily email!

Test Your Vocabulary

The Eponym Quiz

  • rubens painting
  • Which is the best synonym of bowdlerize?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

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

Love words? Need even more definitions?

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