Actinopterygii

plural noun

Ac·​ti·​nop·​te·​ryg·​ii
¦ak-tə-ˌnäp-tə-ˈri-jē-ˌī
in many classifications
: a subclass or other division of Teleostomi comprising fishes having the projecting part of the paired fins supported only by dermal rays and being coextensive with the Teleostomi excluding the Choanichthyes
actinopterygious
¦ak-tə-ˌnäp-tə-ˈri-jē-əs
adjective

Word History

Etymology

New Latin, from actin- + -pterygii (from Greek pteryg-, pteryx wing); akin to Greek pteron feather, wing

First Known Use

1896, in the meaning defined above

Time Traveler
The first known use of Actinopterygii was in 1896

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 Actinopterygii

Cite this Entry

“Actinopterygii.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Actinopterygii. Accessed 14 Jun. 2024.

Love words? Need even more definitions?

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