Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «E»:
Extrinsic: 1. Not an essential or inherent part of a something such as a structure.
2. Coming from the outside. Extrinsic forces can mold the head before birth.
From the Latin extrinsecus meaning from outside. The opposite of extrinsic is intrinsic....
Extubate: To remove a tube from a hollow organ or passageway, often from the airway. The opposite of extubate is intubate.
Extubation: The process of removing a tube from a hollow organ or passageway, often from the airway. The opposite of extubation is intubation.
Exudate: A fluid rich in protein and cellular elements that oozes out of blood vessels due to inflammation and is deposited in nearby tissues. The altered permeability of blood vessels permits the passage of large molecules and solid matter through their walls. The vessels seem to weep, to sweat, i...
Exudative angina: This has nothing whatsoever to do
with the usual type of angina (angina pectoris) which is chest pain
of cardiac origin. Angina trachealis is more commonly known as croup.
This is an infection of the larynx, trachea, and the bronchial
tubes, that occurs mainly in children. It is...
EYCL1: A gene for green/blue eye color located on chromosome 19. See also: Eye color....
EYCL2: A gene for brown eye color. See also: Eye color....
EYCL3: A gene for brown/blue eye color located on chromosome 15. See also: Eye color....
Eye: The organ of sight. The
eye has a number of components. These components include but are not limited to the cornea,
iris, pupil, lens,
retina, macula, optic nerve, choroid and vitreous.
The cornea is the clear front window of the eye that
transmits and focuses
light into the eye.
The iris is...
Eye bank: A place to store corneas (the clear "front window" of the eye) for use in future keratoplasty (surgery to replace the cornea)....
Eye bleed: Medically called a subconjunctival hemorrhage. A very common cause of a painless bloody eye usually first noticed by somebody else or by the person with it when they look in the mirror. The bleeding results from a break in a small blood vessel in the sclera, the white of the eye. This re...
Eye cataract: A clouding of the lens of the eye. The
clear aspirin-sized lens of the eye starts to become cloudy. The
result is much like smearing grease over the lens of a camera. It
impairs normal vision.
There are many causes of cataracts including cortisone medication,
Eye chart test
Eye chart test: This test measures how well you see at various distances. The eye chart itself -- the usual one is called Snellen's chart -- is imprinted with block letters that line-by-line decrease in size, corresponding to the distance at which that line of letters is normally visible.
Eye chart, Snellen's
Eye chart, Snellen's: The familiar eye chart used to measure how well you see at various distances.
Snellen's chart is imprinted with block letters that line-by-line decrease in size, corresponding to the distance at which that line of letters is normally visible.
The letters on Snellen's chart a...
Eye color: The color of the iris. The genetics of eye color are complicated. Eye color is polygenic. It is determined by multiple genes. The eye color genes include EYCL1 (a green/blue eye color gene located on chromosome 19), EYCL2 (a brown eye color gene) and EYCL3 (a brown/blue eye color gene loc...