noun Astronomy.
a planet that revolves around a star other than the sun.

1970–75; exo- + planet

exoplanetary, adjective
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World English Dictionary
exoplanet (ˈɛksəʊˌplænɪt)
a planet that orbits a star in a solar system other than that of Earth

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
exoplanet   (ěk'sō-plān'ĭt)  Pronunciation Key 
See extrasolar planet.
The American Heritage® Science Dictionary
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