• synonyms


noun Astronomy.
  1. a planet that revolves around a star other than the sun.
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Origin of exoplanet

First recorded in 1970–75; exo- + planet
Related formsex·o·plan·e·tar·y, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for exoplanet


  1. a planet that orbits a star in a solar system other than that of Earth
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

exoplanet in Science


  1. See extrasolar planet.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.