am·​phi·​ox·​ea | \ ˌamfēˈäksēə, -ē(ˌ)äkˈsēə \
plural -s

Definition of amphioxea

: a slightly curved needlelike sponge spicule

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 amphioxea

1899, in the meaning defined above

History and Etymology for amphioxea

New Latin, from amphi- + oxea

Keep scrolling for more

Learn More about amphioxea

Time Traveler for amphioxea

Time Traveler

The first known use of amphioxea was in 1899

See more words from the same year

Statistics for amphioxea

Cite this Entry

“Amphioxea.” Dictionary, Merriam-Webster, Accessed 13 Aug. 2020.

Comments on amphioxea

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


Test Your Vocabulary

Original Meanings Quiz

  • rembrandt painting a young scholar and his tutor
  • Which of the following is the earliest known sense of the word awe?
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

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!