galilean satellite

World English Dictionary
Galilean satellite (ˌɡælɪˈleɪən) [Click for IPA pronunciation guide]
 
n
any of the four large satellites of the planet Jupiter -- Io, Europa, Ganymede, or Callisto -- discovered in 1610 by Galileo

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
galilean satellite

noun
one of the four satellites of Jupiter that were discovered by Galileo 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Galilean satellite is always a great word to know.
So is callithumpian. Does it mean:
a chattering or flighty, light-headed person.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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