Terrestrial refers to things related to

land Land, also known as dry land, ground, or earth, is the solid terrestrial surface of Earth not submerged by the ocean or another body of water. It makes up 29.2% of Earth's surface and includes all continents and islands. Earth's land sur ...

or the planet

Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...

, as opposed to extraterrestrial. Terrestrial may also refer to: *

Terrestrial animal Terrestrial animals are animals that live predominantly or entirely on land (e.g. cats, chickens, ants, most spiders), as compared with aquatic animals, which live predominantly or entirely in the water (e.g. fish, lobsters, octopuses), ...

, an animal that lives on land opposed to living in water, or sometimes an animal that lives on or near the ground, as opposed to arboreal life (in trees) ** A fishing fly that simulates the appearance of a land insect is referred to as a terrestrial fly. *

Terrestrial ecoregion An ecoregion (ecological region) is an ecological and geographic area that exists on multiple different levels, defined by type, quality, and quantity of environmental resources. Ecoregions cover relatively large areas of land or water, and c ...

, land ecoregions, as distinct from freshwater ecoregions and marine ecoregions *

Terrestrial ecosystem Terrestrial ecosystems are ecosystems that are found on land. Examples include tundra, taiga, temperate deciduous forest, tropical rain forest, grassland, deserts. Terrestrial ecosystems differ from aquatic ecosystems by the predominant presen ...

, an ecosystem found only on landforms *

Terrestrial gamma-ray flash A terrestrial gamma-ray flash (TGF), also known as dark lightning, is a burst of gamma rays produced in Earth's atmosphere. TGFs have been recorded to last 0.2 to 3.5 milliseconds, and have energies of up to 20 million electronvolts. It is spe ...

, a burst of gamma rays produced in Earth's atmosphere *

Terrestrial locomotion Terrestrial locomotion has evolution, evolved as animals adapted from ecoregion#Marine, aquatic to ecoregion#Terrestrial, terrestrial environments. Animal locomotion, Locomotion on land raises different problems than that in water, with reduced f ...

, evolutionary adaptation from aquatic types of locomotion *

Terrestrial plant A terrestrial plant is a plant that grows on, in or from land. Other types of plants are aquatic plant, aquatic (living in or on water), semiaquatic (living at edge or seasonally in water), epiphyte, epiphytic (living on other plants), and litho ...

, a plant that grows on land rather than in water or on rocks or trees *

Terrestrial planet A terrestrial planet, tellurian planet, telluric planet, or rocky planet, is a planet that is composed primarily of silicate, rocks or metals. Within the Solar System, the terrestrial planets accepted by the IAU are the inner planets closest to ...

, a planet that is primarily composed of silicate rocks, and thus "Earth-like" *

Terrestrial radio Radio broadcasting is the broadcasting of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. In terrestrial radio broadcasting the radio waves are broadcast by a land-based radio ...

, radio signals received through a conventional aerial, as opposed to satellite radio * Terrestrial radiation, due to the insolation of heat by the earth surface, earth re-radiates the heat to the atmosphere in the form of long waves *

Terrestrial reconnaissance Ground reconnaissance (also terrestrial reconnaissance, ground recon), is a type of reconnaissance that is employed along the elements of ground warfare Land warfare or ground warfare is the process of military operations eventuating in combat t ...

, a type of reconnaissance that is employed along the elements of ground warfare *

Terrestrial reference frame A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame, or terrestrial reference frame) is a global datum reference or reference frame for unambiguously representing the posi ...

, the reference frame as one views from earth *

Terrestrial television Terrestrial television, or over-the-air television (OTA) is a type of television broadcasting in which the content is signal transmission, transmitted via radio waves from the terrestrial (Earth-based) transmitter of a TV station to a TV rece ...

, television signals received through a conventional aerial, as opposed to satellite television or cable television *

Terrestrial Time Terrestrial Time (TT) is a modern astronomical time standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of Earth. For example, the Astronomical Almanac uses ...

, an astronomical time standard *

Terrestrial Trunked Radio Tetra is the common name of many small freshwater characiform fishes. Tetras come from Africa, Central America, and South America, belonging to the biological families Characidae, Alestidae (the "African tetras"), Lepidarchidae, Lebias ...

, a specialist walkie talkie standard used by police departments, fire departments, ambulance services and the military *

Cretaceous Terrestrial Revolution The Cretaceous Terrestrial Revolution (abbreviated KTR), also known as the Angiosperm Terrestrial Revolution (ATR) by authors who consider it to have lasted into the Palaeogene, describes the intense floral diversification of flowering plants (ang ...

, the intense diversification of land animals * Terretial bacteria, bacteria that lives in space * Earthly, as

worldly The world is the totality of entities, the whole of reality, or everything that exists. The nature of the world has been conceptualized differently in different fields. Some conceptions see the world as unique, while others talk of a "plu ...

and opposite to

otherworld In historical Indo-European religion, the concept of an otherworld, also known as an otherside, is reconstructed in comparative mythology. Its name is a calque of ''orbis alius'' (Latin for "other world/side"), a term used by Lucan in his desc ...

See also