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planetoid

 - 4 dictionary results

plan⋅et⋅oid

  [plan-i-toid]
Use planetoid in a Sentence
–noun Astronomy.
an asteroid.
Origin:
1795–1805; planet + -oid

Related forms:
plan⋅et⋅oi⋅dal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To planetoid
as·ter·oid   (ās'tə-roid')   
n.  

  1. Astronomy Any of numerous small celestial bodies that revolve around the sun, with orbits lying chiefly between Mars and Jupiter and characteristic diameters between a few and several hundred kilometers. Also called minor planet, planetoid.

  2. Zoology See starfish.

adj.   also as·ter·oi·dal (ās'tə-roid'l)
Star-shaped.

[From Greek asteroeidēs, starlike : astēr, star; see ster-3 in Indo-European roots + -oeidēs, -oid.]
plan·e·toid   (plān'ĭ-toid')   
n.  See asteroid.
plan'e·toi'dal (-toid'l) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
planetoid   (plān'ĭ-toid')  Pronunciation Key 
See asteroid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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