Cassini division

noun
Cas·​si·​ni division | \ka-ˈsē-nē-\
variants: or less commonly Cassini Division

Definition of Cassini division 

astronomy

: the dark region between the two brightest rings of Saturn A sequence of smoothly undulating brightness fluctuations is observed in the outer Cassini division within a band located between Cassini division120,000 and 121,900 km from the centre of Saturn.— Jeffrey N. Cuzzi et al., Nature, 20 Aug. 1981 This consensus lasted until 1675, when astronomer Jean Dominique Cassini reported a dark line (now known as the Cassini Division) within the rings, dividing them into two segments—an inner ring and an outer ring.— Alan Rubin, Astronomy, December 2002

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 Cassini division

1870, in the meaning defined above

History and Etymology for Cassini division

after Giovanni Domenico Cassini †1712 Italian engineer & astronomer

Keep scrolling for more

Learn More about Cassini division

Share Cassini division

Statistics for Cassini division

Look-up Popularity

Time Traveler for Cassini division

The first known use of Cassini division was in 1870

See more words from the same year

Comments on Cassini division

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

WORD OF THE DAY

by force of circumstances

Get Word of the Day daily email!

Test Your Vocabulary

Difficult Vocab Quiz

  • the-education-of-achilles-eugne-delacroix
  • Which is a synonym of discomfit?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

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!