Ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the earth.

A heat pump system that uses the ground as a heat source and/or heat sink.

A ground-coupled heat exchanger is an underground heat exchanger that can capture heat from and/or dissipate heat to the ground.

Connected to earth, or an extended conducting body, e.g. the hull of a ship, which acts as an earth.

The term used when a vessel runs aground in an area where groundings are so common that the insurer of the ship considers it should not be deemed stranding.

A grounding transformer or earthing transformer is a type of auxiliary transformer used in three-phase electric power systems to provide a ground path to either an ungrounded wye or a delta-connected system.

Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations.

Groundwater pollution (also called groundwater contamination) occurs when pollutants are released to the ground and make their way down into groundwater.

A material used during the grouting process specifically designed to form a hydraulic barrier in a geothermal borehole to promote transfer between the ground sorce heat exchanger piping and the earth.

The practice of making a conscious effort to form a hydraulic barrier in a geothermal borehole to protect the integrity of the deep earth environment.

A growler is an electrical device used for testing insulation of a motor for shorted coils.

Gas to Liquids

Bosses or lugs on sternpost drilled for the pins (pintles) on which the rudder hinges.

The junction of deck and shell at top of sheer strake.

A triangular plate, usually fitted to distribute forces at a strength connection between two structural members.

A guy-wire, guy-line, or guy-rope, also known as simply a guy, is a tensioned cable designed to add stability to a free-standing structure.

A special hall or room that has equipment for doing physical exercises.

A device used for measuring or maintaining orientation and angular velocity, used in positioning for offshore wind turbines.