plural noun

: a division usually made a suborder of Testudinata comprising turtles with the carapace separate from the internal skeleton and usually with greatly reduced ossification and represented among recent forms by the marine leatherback
adjective or noun

Word History


New Latin, from feminine plural of (assumed) New Latin athecus having no cover, from New Latin a- entry 2 + (assumed) New Latin -thecus (from Latin theca cover, sheath)

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 Athecae

Cite this Entry

“Athecae.” Dictionary, Merriam-Webster, Accessed 21 Apr. 2024.

Love words? Need even more definitions?

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