terrestrial
terrestrial — adjective
1. relating to the planet Earth, especially when the focus is on the physical, mate
relating to the planet Earth, especially when the focus is on the physical, material world in contrast to outer space or spiritual matters.
The telescope was designed to study terrestrial weather patterns from space.
attributive: terrestrial + weather patterns
Wei's research focuses on terrestrial ecosystems and how they cope with rising temperatures.
collocation: terrestrial ecosystem
The book contrasts spiritual life with our daily terrestrial existence.
Geologists study terrestrial rocks to learn how the planet was formed.
Satellites send back images of terrestrial landscapes that help map remote areas.
- extraterrestrial
relating to anything outside Earth
- heavenly
relating to the sky or spiritual realms
文法句型
terrestrial + noun
be terrestrial
用法筆記
In this sense, 'terrestrial' is most often used before a noun (attributive position). It can sound overly formal in casual conversation — 'on Earth' or 'Earth's' is usually simpler.
常見錯誤
2. describing a planet with a solid, rocky surface like Earth, as opposed to a gas
describing a planet with a solid, rocky surface like Earth, as opposed to a gas giant or ice giant.
Mars is classed as a terrestrial planet because it has a hard, rocky surface.
classed / classified as a terrestrial planet
The four inner planets — Mercury, Venus, Earth, and Mars — are all terrestrial.
predicative use: are terrestrial
Astronomers have found several terrestrial planets orbiting distant stars.
Unlike Jupiter, which is a gas giant, Venus is a small terrestrial world.
- Earth-like
less technical; used in popular science writing
- rocky
informal; describes the solid surface but not the full geological classification
文法句型
terrestrial planet
be terrestrial
用法筆記
Almost always paired with 'planet' or 'world' in astronomy writing. The opposite is 'gas giant' (like Jupiter) or 'ice giant' (like Neptune).
常見錯誤
3. describing a plant or animal that makes its natural home on solid ground — as op
describing a plant or animal that makes its natural home on solid ground — as opposed to those that live in water, up in trees, or by flying.
Frogs are not purely terrestrial animals — they need water to reproduce.
purely terrestrial + negation for contrast
The nature reserve is home to both terrestrial birds and various sea birds.
contrast: terrestrial birds vs. sea birds
Terrestrial snails have lungs, while sea snails breathe through gills.
Botanists call this plant a terrestrial orchid because it grows in soil, not on trees.
Most terrestrial mammals walk on four legs, but humans walk on two.
- land-dwelling
plain English equivalent; preferred in non-scientific contexts
- ground-dwelling
specifically refers to animals that live on the ground rather than in trees or burrows
文法句型
terrestrial + noun (animal / plant / species)
be terrestrial
用法筆記
Commonly contrasts with 'aquatic' (water), 'arboreal' (tree-dwelling), or 'aerial' (air-borne). In biology writing, 'terrestrial' specifies habitat type.
常見錯誤
4. describing a broadcasting method in which television or radio signals travel fro
describing a broadcasting method in which television or radio signals travel from ground-level equipment, not via satellites orbiting above the planet.
Many rural areas still rely on terrestrial television because satellite dishes cost too much.
collocation: terrestrial television
Terrestrial radio signals cannot cross the ocean without help from satellites.
contrast: terrestrial radio vs. satellite
Noa prefers terrestrial TV channels because they do not require a monthly subscription.
The government plans to upgrade the country's terrestrial broadcasting network to digital.
- ground-based
more general term; used for any equipment on the Earth's surface
- over-the-air
common in North America; refers to signals sent through the air without cable or satellite
文法句型
terrestrial + television / broadcasting / channel / radio
用法筆記
Frequently appears in news stories about broadcasting policy. The main contrast is with 'satellite TV' or 'cable TV'. In everyday speech, 'free-to-air' is a common synonym in British English.