terrestrial

adjective

ter·​res·​tri·​al tə-ˈre-st(r)ē-əl How to pronounce terrestrial (audio) -ˈres-chəl How to pronounce terrestrial (audio)
-ˈresh-
1
a
: of or relating to the earth or its inhabitants
terrestrial magnetism
b
: mundane in scope or character : prosaic
2
a
: of or relating to land as distinct from air or water
terrestrial transportation
b(1)
: living on or in or growing from land
terrestrial plants
terrestrial birds
(2)
: of or relating to terrestrial organisms
terrestrial habits
3
: belonging to the class of planets that are like the earth (as in density and silicate composition)
the terrestrial planets Mercury, Venus, and Mars
terrestrial noun
terrestrially adverb

Did you know?

Terrestrial might be a pretty down-to-earth word, but some of its relatives are out of this world. "Terrestrial" first appeared in English in the 15th century and derives from the Latin root terra, which means "earth." In the mid-1800s "extra-" was added to "terrestrial," giving us "extraterrestrial," an adjective that can be used to describe things (including science fiction creatures) that come from space. "Terrestrial" shares the "-al" suffix with "celestial," which was first used in the 14th century. Not surprisingly, "celestial" ("of or relating to the sky or visible heavens") traces back to the Latin for sky, "caelum."

Examples of terrestrial in a Sentence

The toad has terrestrial habits, spending most of its time on shore. scientists haven't even found all the terrestrial life on our planet
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The new study suggests, however, that records of ancient tsunamis may be found in the form of amber and other terrestrial material deposited in deep-sea sediments. Sam Walters, Discover Magazine, 15 May 2025 Moving some of those data centers to space, whether placed in stationary locations on the moon or traveling in near-Earth orbit, could reduce the environmental impact of our terrestrial digital infrastructure. Michael Wu, Forbes.com, 14 May 2025 Official records such as local gazettes and county chronicles didn’t have any information about the porpoises — only terrestrial megafauna like tigers and elephants, species that have frequent conflict with humans. Marlowe Starling, CNN Money, 14 May 2025 Tegus are terrestrial lizards that hail from South America. Sarah Kuta, Smithsonian Magazine, 13 May 2025 See All Example Sentences for terrestrial

Word History

Etymology

Middle English, from Latin terrestris, from terra earth — more at terrace entry 1

First Known Use

15th century, in the meaning defined at sense 1a

Time Traveler
The first known use of terrestrial was in the 15th century

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Cite this Entry

“Terrestrial.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/terrestrial. Accessed 25 May. 2025.

Kids Definition

terrestrial

adjective
ter·​res·​tri·​al tə-ˈres-trē-əl How to pronounce terrestrial (audio) -ˈres-chəl How to pronounce terrestrial (audio)
-ˈresh-chəl
1
: of or relating to the earth or its living things
2
a
: of or relating to land as distinct from air or water
terrestrial transportation
b
: living on or in or growing from land
terrestrial plants
terrestrial birds

More from Merriam-Webster on terrestrial

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