plural noun
Ac·​tin·​i·​ar·​ia | \ ¦ak-ˌti-nē-¦a-rē-ə, -ˈer-ē-\

Definition of Actiniaria

: an order or suborder of Anthozoa (subclass Zoantharia) comprising the sea anemones which differ from the corals in forming no hard skeleton and in existing as separate individuals

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 Actiniaria

1856, in the meaning defined above

History and Etymology for Actiniaria

borrowed from New Latin, from Actinia actinia + -aria -aria entry 2

Keep scrolling for more

Learn More about Actiniaria

Statistics for Actiniaria

Look-up Popularity

Time Traveler for Actiniaria

The first known use of Actiniaria was in 1856

See more words from the same year

Comments on Actiniaria

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


of or relating to the heavens

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
Name That Thing

Test your visual vocabulary with our 10-question challenge!


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!