Emitting is for example the release of particles (electrons, etc.) or rays (x-rays, etc.) as a consequence of e.g. a nuclear (decay, fission, or fusion) process.

See also Decay and Beta Radiation.

Emphysema is a lung disease characterized by increased size of air spaces, including destructive changes in the walls and reduction in their number.

An endoscopy is a visual examination of the interior of a hollow body organ by use of an endoscope, often including a biopsy.

An enema is a medical procedure that involves the administration of drugs or substances to clear the bowel or the injection of liquid into the intestine through the rectum.

In physics, energy is described as the ability to do work by a force, measured in joules (J).
Several different forms of energy exist to describe various natural phenomena.

See also Photon Energy, Rest Energy, Binding Energy, Kinetic Energy and Effective Energy.