plural noun
Prot·​ephemerida | \ (¦)prōt+\

Definition of Protephemerida

: an order of extinct insects related to the Ephemeroptera, known only from the Upper Carboniferous, and characterized by long cerci and homonomous wings with numerous crossveins

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 Protephemerida

New Latin, from prot- + Ephemerida

Keep scrolling for more

Comments on Protephemerida

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


to spread over or through

Get Word of the Day daily email!

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!

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!