Terrestrial refers to things related to land or the planet Earth. Terrestrial may also refer to: * Terrestrial animal, 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, land ecoregions, as distinct from freshwater ecoregions and marine ecoregions * Terrestrial ecosystem, an ecosystem found only on landforms * Terrestrial gamma-ray flash, a burst of gamma rays produced in Earth's atmosphere * Terrestrial locomotion, evolutionary adaptation from aquatic types of locomotion * Terrestrial plant, a plant that grows on land rather than in water or on rocks or trees * Terrestrial planet, a planet that is primarily composed of silicate rocks, and thus "Earth-like" * Terrestrial radio, radio signals received through a conventional aerial, as opposed to satellite radio *

Terrestrial radiation Background radiation is a measure of the level of ionizing radiation present in the environment at a particular location which is not due to deliberate introduction of radiation sources. Background radiation originates from a variety of sources ...

, 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 {{unreferenced, date=December 2008 Terrestrial reconnaissance, or ''ground'' recon, is a type of reconnaissance that is employed along the elements of ground warfare. It is the collection of intelligence that strictly involves routes, areas, zones ...

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

Terrestrial reference frame A terrestrial reference frame (TRF) is the reference frame as one views from Earth, or from the surface of another Earth-like planet. A TRF affects the way humans perceive almost everything from day to day because as they live on the Earth, as a ...

, the reference frame as one views from earth * Terrestrial television, 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 T ...

, an astronomical time standard * Terrestrial Trunked Radio, 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 diversification of angiosperms, insects, reptiles ...

, the intense diversification of land animals

See also