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1. Greek Mythology A nymph, beloved of Zeus and hated by Hera. Hera changed her into a bear, and Zeus then placed her in the sky as the constellation Ursa Major.
2. One of the four brightest satellites of Jupiter. Originally sighted by Galileo, it is the third largest satellite in the solar system.

[Latin, from Greek Kallistō, perhaps from kallistos, superlative of kalos, beautiful.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Classical Myth & Legend) Greek myth a nymph who attracted the love of Zeus and was changed into a bear by Hera. Zeus then set her in the sky as the constellation Ursa Major


(Celestial Objects) the second largest (but faintest) of the four Galilean satellites of Jupiter, discovered in 1610 by Galileo. Approximate diameter: 4800 km; orbital radius: 1 883 000 km. See also Galilean satellite
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(kəˈlɪs toʊ)

1. a nymph changed into a bear by Hera as punishment for a love affair with Zeus, and then transformed into the constellation Ursa Major.
2. a large moon of the planet Jupiter.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Noun1.Callisto - the second largest of Jupiter's satellites
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References in classic literature ?
Thus she became a bear and gave birth to a son called Arcas. But while she was in the mountains, she was hunted by some goat-herds and given up with her babe to Lycaon.
The story goes that he is Arcas the son of Callisto and Zeus, and he lived in the country about Lycaeum.
In the meantime you must make yourself contented by the consciousness of success, like the Roman miser -- "`Populus me sibilat, at mihi plaudo Ipse domi simul ac nummos contemplar in arca.'"
JULIO ARCA may well hail from the other side of the globe's equator but he has certainly made an indelible impression here in the North East.
Arca's links also extend to Newcastle - he was with United skipper Fabricio Coloccini the backbone of Argentina's team that lifted the FIFA Under 20 World Cup of 2001 and, later, had the dubious distinction of being the man who accidentally ended the career of Newcastle legend Alan Shearer at the Stadium of Light.
In 1832 William Swainson established the generic name Arcas with type species Papilio imperialis Cramer, 1775.
In Colombia Arcas imperialis is a familiar species for lepidopterists because its wide distribution and beauty.
The Senate committee found that Foley was 'not justified in reversing the suspension of ARCAS' [Air Operators Certificate] and rejects argument by CASA that subsequent investigations proved Mr Foley's decision to be correct', according to
The document describing the provisional erection of Donatello's altar in 1448 for the benefit of forestieri or foreign pilgrims suggests that the Arca was concerned with these types of viewers as well.
More and more companies are establishing their commercial presence in ARCA South.
The new packaging solution, based on the Arca Combo bulk liquid handling product, is designed to streamline the delivery process between Coca-Cola's European syrup production plants and high volume users of soft drinks, such as bars, cinemas and sports venues.