A deep geological repository is a way of storing toxic or radioactive waste within a stable geologic environment (typically 200–1000 m deep).

Deepwater generally means greater than 500m, whereas very deep water means 1000m or deeper for offshore pipeline installations.

Water depths greater than 60 meters.

Deep water source cooling (DWSC) or deep water air cooling is a form of air cooling for process and comfort space cooling which uses a large body of naturally cold water as a heat sink.

The traffic routes of both cargo and passenger vessels which regularly operate on the high seas or on long voyages.

Electrically- or hydraulically-driven cargo pumps used in tanker cargo pumping system. A deepwell pump is submerged in the fluid that it is pumping with its impeller placed in a well in the tanktop...

A discontinuity or discontinuities that by nature or accumulated effect (for example total crack length) render a part or product unable to meet the minimum applicable acceptance standards or specifications. This term designates rejectability.

A weld with one or more defects.

Deformation refers to the change in size or shape of an object.

A degasser is a device used in drilling to remove gasses from drilling fluid which could otherwise form bubbles.

Reducing the humidity. Humidity and condensation can cause damage to cargoes and also to the holds or tanks containing them.

A substance or a machine used to reduce humidity in holds or cargo tanks. Calcium chloride and silica gel are water-absorbing chemicals (desiccants) commonly in use.

Peeling from undercoat or substrate.

A delayed neutron is a neutron emitted after a nuclear fission event, by one of the fission products, any time from a few milliseconds to a few minutes after the fission event.

Difference in pressure between two test points

Temperature difference between two test sites such as supply and return air or entering and leaving water in ground loop.

A type of three-phase electric power transformer design that employs delta-connected windings on its primary and wye/star connected windings on its secondary.

The electrical input required to operate a ground source heat pump unit for space conditioning.

Demand response is a change in the power consumption of an electric utility customer to better match the demand for power with the supply.

Demand-side management is the modification of consumer demand for energy through various methods such as financial incentives and behavioral change through education.