plural noun
Pro·​to·​coccaceae | \ ¦prōt(ˌ)ō+\

Definition of Protococcaceae

: a family of unicellular green algae that is coextensive with the genus Protococcus and is now usually placed in the order Ulotrichales but is sometimes isolated in a separate order or especially formerly included in Chlorococcales or Chaetophorales

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 Protococcaceae

New Latin, from Protococcus, type genus + -aceae

Keep scrolling for more

Comments on Protococcaceae

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


a topic to which one constantly reverts

Get Word of the Day daily email!

Test Your Vocabulary

Where in the World? A Quiz

  • peter bruegel tower of babel painting
  • What language does pajama come from?
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!