Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «V»:
Vitamin K: One of two naturally occurring fat-soluble
vitamins (vitamin K1 and vitamin K2) needed for the clotting of blood
because of an essential role in the production of prothrombin (a
clotting factor). The term vitamin A may also refer to a synthetic
compound that is closely related chemica...
Vitamin O: Not a true vitamin but rather a pricey health supplement that is composed largely of salt water (plus some germanium, a trace element dangerous to health).
The US Federal Trade Commission (FTC) charged the manufacturer of Vitamin O with fraud for touting it as a cure for cancer and heart...
Vitamin P: An old name for substances now known
as bioflavinoids. They are no longer considered to be
vitamins by the strict definition of that word....
Vitamin Q10: See: Coenzyme Q10....
Vitamin requirements, infant
Vitamin requirements, infant: Vitamins are organic substances that are essential in minute quantities for the proper growth, maintenance, and functioning of the baby. Vitamins must be obtained from food because the body cannot produce them. The exception is vitamin D, which can be produced by the sk...
Vitamin therapy: The use of vitamins to prevent or
cure disease. Many
physicians are now recognizing the beneficial uses of anti-oxidant and other
vitamins for a wide variety of conditions, often as a complementary therapy to
accompany medication or other treatments. One variant on this theme, m...
word "vitamin" was coined in 1911 by the Warsaw-born
biochemist Casimir Funk (1884-1967). At the Lister Institute in
London, Funk isolated a substance that prevented nerve inflammation
(neuritis) in chickens raised on a diet deficient in that substance.
He named the substance "...
Vitiligo: Pronounced vit-uh-LIE- go. A condition in which the skin turns white due to the loss of melanocytes. These cells produce melanin, the pigment that gives the skin its characteristic color. (Melanocytes also impart color to the retina of the eye and the mucous membrane tissues lining the in...
Vitrectomy: Removal of the gel (called the vitreous) from within the eyeball. This may be done because it has blood and scar tissue in it that blocks sight. An eye surgeon then replaces the clouded gel with a clear fluid....
Vitreous: A clear, jelly-like substance that
fills the middle of the eye.
Also called the vitreous humor, "humor" in medicine
referring to a fluid (or
Vitreous type 2 Stickler syndrome
Vitreous type 2 Stickler syndrome: Stickler syndrome, type II. See: Stickler syndrome....
Vitreous type Stickler syndrome
Vitreous type Stickler syndrome: Stickler syndrome, type I. See: Stickler syndrome....
Vocal cord: One of two small bands of
muscle within the larynx. These muscles vibrate to produce the
voice. The vocal cords form a "V" inside the larynx, a 2-inch-long,
tube-shaped organ in the neck:
We use the larynx when we breathe, talk, or swallow. Its outer wall
of cartilage forms the a...
Vocal cord paralysis
Vocal cord paralysis: Inability of one or both vocal folds (vocal cords) to move. The paralysis is usually due to damage to the nerves going to the vocal cords or due to damage to the brain itself.
In more technical terms, vocal cord paralysis may result from lesions in the nucleus ambiguus or its s...
Vocal cord, false
Vocal cord, false: See: False vocal cord....