amphioxus

noun
am·​phi·​ox·​us | \ ˌam(p)-fē-ˈäk-səs How to pronounce amphioxus (audio) \
plural amphioxi\ ˌam(p)-​fē-​ˈäk-​ˌsī How to pronounce amphioxi (audio) \ or amphioxuses

Definition of amphioxus

: any of a genus (Branchiostoma) of lancelets broadly : lancelet

First Known Use of amphioxus

1837, in the meaning defined above

History and Etymology for amphioxus

New Latin, from amphi- + Greek oxys sharp

Keep scrolling for more

Learn More about amphioxus

Time Traveler for amphioxus

Time Traveler

The first known use of amphioxus was in 1837

See more words from the same year

Statistics for amphioxus

Cite this Entry

“Amphioxus.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/amphioxus. Accessed 24 January 2020.

Keep scrolling for more

More Definitions for amphioxus

amphioxus

noun
am·​phi·​ox·​us | \ ˌam(p)-fē-ˈäk-səs How to pronounce amphioxus (audio) \
plural amphioxi\ -​ˌsī How to pronounce amphioxi (audio) , -​ˌsē How to pronounce amphioxi (audio) \ or amphioxuses

Medical Definition of amphioxus

 (Entry 1 of 2)

: a lancelet of the genus Branchiostoma broadly : lancelet

Amphioxus

noun

Medical Definition of Amphioxus (Entry 2 of 2)

taxonomic synonym of branchiostoma

More from Merriam-Webster on amphioxus

Britannica.com: Encyclopedia article about amphioxus

Comments on amphioxus

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

WORD OF THE DAY

a feeling of well-being or elation

Get Word of the Day daily email!

Test Your Vocabulary

Intact Latin Quiz

  • roman tablet
  • What did focus mean in Latin?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Syn City

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

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