plural noun
Hy·​drach·​nel·​lae | \ ˌhīˌdrakˈne(ˌ)lē\

Definition of Hydrachnellae

: a superfamily or higher group of Acarina comprising freshwater and marine mites that are usually rather large and often bright red, that have two pairs of eyes, tarsi usually with two claws and without an empodium, and chelicerae with a sickle-shaped movable digit, and that with few exceptions breathe by means of a well-developed tracheal system — see halacaridae , hydrachnidae

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 Hydrachnellae

New Latin, from Hydrachna + -ellae (plural of -ella)

Keep scrolling for more

Comments on Hydrachnellae

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


a wrong name or inappropriate designation

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Word Winder's CrossWinder

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!