Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «S»:
Snake stick: A stick or rod with a snake curled
around it is the staff (the rod)
of Aesculapius (also called Asklepios), the ancient
mythical god of
His Greek name was Asklepios and his Roman name
Aesculapius. In reality,
Asklepios may have once lived and been renowned for his
SNCA: The gene for alpha-synuclein....
Sneeze: 1. As a verb, to suddenly expel air through the nose and mouth by an involuntary contraction of the muscles of expiration.
2. As a noun, the act of sneezing.
Sneezing is commonly caused by irritation of the nasal passages, as from pollens, house dust, pepper, or other particles. The sound o...
Snellen's chart: 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 are, n...
Snellen's test type
Snellen's test type: The letters on the familiar eye chart used to measure how well you see at various distances.
The eye chart, known as 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 vis...
Snip: A single base change, a change in which a single base in the DNA differs from the usual base at that position. "Snips" are also termed SNPs.
Millions of SNP's have been cataloged in the human genome. Some SNPs such that which causes sickle cell are responsible for disease. Other SNPs are norm...
Snoreplasty, injection: An injection of a chemical called sodium tetradecyl sulfate that promotes stiffening of the soft palate by creating scar tissue in order to relieve snoring. The soft palate is the area above your throat in the back of your mouth. Snoring is typically caused by the fluttering ...
Snoring: A rough rattling noise made on inspiration during sleep by vibration of the soft palate (the back of the
roof of the mouth) and the uvula (the prominent structure dangling down at the back of the mouth).
On inspiration, air on its way to the lungs travels by the tongue, the soft palate, th...
Snort: Take in a drug by inhalation. For example, snorting cocaine is inhaling cocaine powder through the nose where it is absorbed through the nasal tissues into the bloodstream....
Snot: A popular, perjorative, and somewhat offensive term for nasal mucus (mucus produced in the nose)....
Snowblindness: A burn of the cornea (the clear front surface of the eye) by ultraviolet B rays (UVB). Also called radiation keratitis or photokeratitis.
The condition typically occurs at high altitudes on highly reflective snow fields or, less often, with a solar eclipse. Artificial sources of UVB ...
Snowmobile safety: Snowmobiles pose a significant risk to children, adolescents and young adults. Head injuries are the leading cause of mortality (death) and serious morbidity (disease). They are due mainly to snowmobilers colliding, falling, or overturning. Children also are injured while being to...
SNP: A change in which a single base in the DNA differs from the usual base at that position. These single base changes are called SNPs or "snips."
Millions of SNP's have been cataloged in the human genome. Some SNPs
such that which causes sickle cell are responsible for disease. Other SNPs are no...
Snuff: Tobacco in the form of a powder that is inhaled into the nose, not smoked.
Snuff and chewing tobacco are the two main forms of smokeless tobacco in use in the United States.
Cancers of the oral cavity (i.e., the mouth, lip, and tongue) have been associated with the use of chewing tobacco as ...
Snuffbox, anatomical: A hollow seen on the radial aspect (the thumbside) of the dorsum (the back) of the wrist when the thumb is extended fully. The reason that it is called the anatomical snuffbox is that snuff (powdered tobacco) could be put there and then inhaled....