capitalized : a genus of sea urchins (order Centrechinoida) having the ambulacral plates with three pairs of pores, the periproct covered by four triangular plates, the test rather low and stout, and the spines short with those near the mouth having enameled flattened tips
plural -s : a sea urchin of the genus Arbacia

Word History


borrowed from New Latin, perhaps from Arbaces, legendary ninth century b.c. Median general (borrowed from Greek Arbákēs) + -ia -ia

First Known Use

before the 12th century, in the meaning defined at sense 1

Time Traveler
The first known use of arbacia was before the 12th century

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!

Dictionary Entries Near arbacia

Cite this Entry

“Arbacia.” Dictionary, Merriam-Webster, Accessed 22 Jun. 2024.

Love words? Need even more definitions?

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