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terrestrial planet

American  
[tuh-res-tree-uhl plan-it] / təˈrɛs tri əl ˈplæn ɪt /

noun

Astronomy.

  1. a planet composed mostly of metals or silica rocks: in our solar system, the terrestrial planets are the four inner planets.

terrestrial planet Scientific  

  1. See inner planet

Etymology

Origin of terrestrial planet

First recorded in 1885–90

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.