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2017 Word of the Year

terrestrial planet

noun, Astronomy.
Origin of terrestrial planet
1885-1890
First recorded in 1885-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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terrestrial planet in Science
terrestrial planet  
See inner planet.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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11
12
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