DEFINITIONS E



edema
Swelling due to an excess of water.

embryonic
Undeveloped, related to the embryo.

emesis
Vomiting.

encapsulated
Refers to a tumor that is wholly confined to a specific area, surrounded by a capsule. Localized.

epidemiology
The study of the distribution of disease and its impact upon a population, using such measures as incidence, prevalence, or mortality.

etiology
The study of the cause of a disease.

evoked potentials
The use of electrodes to measure the electrical activity of nerves. May be used as a guide during surgical removal of tumors growing around important nerves.

extracerebral
Located outside the cerebral hemispheres.

extradural
External (outside) to the dura mater.