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
-di·one
ˈdīˌōn
plural -s
: chemical compound containing two carbonyl groups
—in names of diketones or di-oxo compounds that are not true diketones
butanedione
2,6-piperidine-dione
Dictionary Entries Near Dione
Cite this Entry
“Dione.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Dione. Accessed 22 Nov. 2024.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share