al·​cy·​o·​noid | \ ˈal-sē-ə-ˌnȯid \
plural -s

Definition of alcyonoid

: one of the Alcyonaria

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 alcyonoid

1857, in the meaning defined above

History and Etymology for alcyonoid

New Latin Alcyonoidea

Keep scrolling for more

Learn More about alcyonoid

Time Traveler for alcyonoid

Time Traveler

The first known use of alcyonoid was in 1857

See more words from the same year

Statistics for alcyonoid

Cite this Entry

“Alcyonoid.” Dictionary, Merriam-Webster, Accessed 23 Feb. 2020.

Comments on alcyonoid

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


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

More Confusing Words—Quiz

  • cats on impossible timber
  • The magician ______ moved the selected card to the top of the deck.
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

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!