ex·tra·so·lar

[ek-struh-soh-ler]
adjective
outside, or originating outside, the sun or the solar system.

Origin:
1885–90; extra- + solar1

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
extrasolar (ˌɛkstrəˈsəʊlə) [Click for IPA pronunciation guide]
 
adj
occurring or existing beyond the earth's solar system

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Extrasolar is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a scrap or morsel of food left at a meal.
Dictionary.com's 21st Century Lexicon
Main Entry:  extrasolar
Part of Speech:  adj
Definition:  outside the solar system
Etymology:  exo- + solar
Dictionary.com's 21st Century Lexicon
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Example sentences
And in some planetary systems, the moons of an extrasolar planet could
  themselves be favorable habitats for extraterrestrial life.
Extrasolar planet hunters are excited about a not-so-hot discovery.
Not to mention the rapidly expanding universe of extrasolar planets.
Also called an extrasolar planet extrasolar planet: noun: planet outside the
  solar system, orbiting a star other than the sun.
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