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[plan-i-toid] /ˈplæn ɪˌtɔɪd/
noun, Astronomy.
an asteroid.
Origin of planetoid
First recorded in 1795-1805; planet + -oid
Related forms
planetoidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for planetoid
Contemporary Examples
Historical Examples
  • The crops continued to grow on the tamed black dirt of the planetoid.

    Beside Still Waters Robert Sheckley
  • I had every executive on the planetoid jumping before I was through.

    A Spaceship Named McGuire Gordon Randall Garrett
  • The next three levels have all been burned into the bowels of the planetoid.

    The Risk Profession Donald Edwin Westlake
  • Then he nudged the Nancy Bell sideways, pushing the bolt down into the planetoid.


    Randall Garrett
  • The tugs would be able to find the planetoid by following the beeps.


    Randall Garrett
  • We are nearing a planetoid, or, as some call them, an asteroid!

    Through Space to Mars Roy Rockwood
  • He knew he must return to the planetoid and somehow kill the opponent.

    The Dueling Machine Benjamin William Bova
  • If we had encountered even a planetoid at that enormous rate, we would probably have been annihilated in white-hot death.

    Raiders of the Universes Donald Wandrei
  • The rocket roared to life and Odal was hurtled free of the boulder, shot uncontrolled completely off the planetoid.

    The Dueling Machine Benjamin William Bova
British Dictionary definitions for planetoid


another name for asteroid (sense 1)
Derived Forms
planetoidal, adjective
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
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planetoid in Science
See asteroid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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