plural noun

Definition of Vespertilionidae

: a very large family of bats (suborder Microchiroptera) found in most parts of the world, including the majority of the common bats of temperate regions, and having separate ears with well-developed tragal lobes, a simple nose without appendages, and a tail that extends to the border of the posterior part of the volar membrane which stretches between the thighs — see vespertilio

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 Vespertilionidae

New Latin, from Vespertilion-, Vespertilio, type genus + -idae

Keep scrolling for more

Learn More about Vespertilionidae

Statistics for Vespertilionidae

Cite this Entry

“Vespertilionidae.” Dictionary, Merriam-Webster, Accessed 20 Oct. 2020.

Comments on Vespertilionidae

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


Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
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!