Dione
1 of 2noun
Di·o·ne ˌdī-ˈō-nē 
astronomy
: the fourth largest satellite of Saturn with a diameter of approximately 700 miles (1120 km)
Three other new Saturnian moons have been identified in recent years by spacecraft and ground-based telescopes. Two of them are especially intriguing because they lie in essentially the same orbit about 94,000 miles from the planet. The third is a small, asteroid-size satellite moving along in the same orbit much farther ahead of the larger moon, Dione, 234,000 miles from Saturn.
John Noble Wilford, New York Times, 29 Oct. 1980
John Noble Wilford, New York Times, 29 Oct. 1980-dione
2 of 2noun suffix
-di·one
ˈdīˌōn
plural -s
: chemical compound containing two carbonyl groups —in names of diketones or di-oxo compounds that are not true diketones
butanedione2,6-piperidine-dione
Word History
Etymology
Noun suffix
International Scientific Vocabulary di- + -one
First Known Use
Noun
1879, in the meaning defined above
- regular canon
- regular canoness
- regular clerk
- Regular Clerk of St. Paul
- regular coffee
- regular customer
- regular deposit
- regular lay
- regular lot
- regular ode
- regular peloria
- regular pyramid
- regular reflection
- regular sequence
- regular solid
- regular year
- regular-lay rope
- Regulares
- Regularia
- regularisation
- regularisations
- regularise
- regularised
- regulariser
- regularisers