Ag·​nos·​tus | \ ag-ˈnä-stəs \

Definition of Agnostus

: a genus of small blind Cambrian and Ordovician trilobites that with a number of related forms in which the cephalon and pygidium are almost indistinguishable constitute an order (Agnostida) of highly specialized forms

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!

First Known Use of Agnostus

1824, in the meaning defined above

History and Etymology for Agnostus

borrowed from New Latin, borrowed from Greek ágnōstos “unknown”

Keep scrolling for more

Learn More about Agnostus

Time Traveler for Agnostus

Time Traveler

The first known use of Agnostus was in 1824

See more words from the same year

Statistics for Agnostus

Cite this Entry

“Agnostus.” Dictionary, Merriam-Webster, Accessed 5 May. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Comments on Agnostus

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


Test Your Vocabulary

Star Wars Words Quiz

  • cu jedi training
  • The bounty portion of bounty hunters (such as Boba Fett) comes from a Latin word meaning
True or False

Test your knowledge - and maybe learn something along the way.

 AlphaBear 2

Spell words. Make bears.

Love words? Need even more definitions?

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