actinopterygian

adjective
ac·​ti·​nop·​te·​ryg·​i·​an | \ ¦ak-tə-ˌnäp-tə-ˈri-jē-ən \

Definition of actinopterygian

 (Entry 1 of 2)

: of or relating to the Actinopterygii

actinopterygian

noun
ac·​ti·​nop·​te·​ryg·​i·​an | \ ¦ak-tə-ˌnäp-tə-ˈri-jē-ən \
plural -s

Definition of actinopterygian (Entry 2 of 2)

: one of the Actinopterygii

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 actinopterygian

Adjective

1871, in the meaning defined above

Noun

1897, in the meaning defined above

History and Etymology for actinopterygian

Adjective

New Latin Actinopterygii + English -an

Keep scrolling for more

Learn More about actinopterygian

Time Traveler for actinopterygian

Time Traveler

The first known use of actinopterygian was in 1871

See more words from the same year

Statistics for actinopterygian

Cite this Entry

“Actinopterygian.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/actinopterygian. Accessed 22 Sep. 2020.

Comments on actinopterygian

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

WORD OF THE DAY

Test Your Vocabulary

Homophone Quiz

  • three bears two of them look like theyre whispering to a third bear who looks chuffed to be the center of attention
  • In order to judge how people felt, the senator's office hired a firm to take a ______.
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

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!