1868, in the meaning defined above
New Latin, from Late Latin radiolus small sunbeam, from diminutive of Latin radius ray — more at ray
Keep scrolling for more
Time Traveler for radiolaria
See more words from the same year
Cite this Entry
“Radiolaria.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radiolaria. Accessed 29 Nov. 2020.
Comments on radiolaria
What made you want to look up radiolaria? 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!
A Thanksgiving Word Quiz
Can you spell these 10 commonly misspelled words?
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Words from the week of 11/27/2020
One's a story, the other's a cure.
Should you need someone to do so
And how the bird got its nickname
We're intent on clearing it up
We're gonna stop you right there
How to use a word that (literally) drives some pe...
The awkward case of 'his or her'
We are thankful for obscure words.
Words to improve your Scrabble game
Build a city of skyscrapers—one synonym at a time.