Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «C»:
CLA: 1. Conjugated linoleic acid.
2. Cervical lymphadenopathy (swollen lymph nodes in the neck).
3. Congenital lactic acidosis.
4. Caseous lymphadenitis (cheeselike lymph nodes, usually due to TB).
Clade: Related organisms descended from a common ancestor. For example, isolate M of HIV-1 (the human immunodeficiency virus) consists of at least ten clades. Imported from the Greek, klados, branch in 1911 in reference to the Tree of Life....
Clamydia: A common misspelling of Chlamydia....
Clap: Gonorrhea, a bacterial infection transmitted by
sexual contact. Gonorrhea is one of the oldest known sexually transmitted diseases (STDs).
In women infected with this bacteria (Neisseria gonorrhoeae), 25-40% will also be infected
with another bacteria that can cause another STD called chlamydi...
Clark level of invasion
Clark level of invasion: A method for determining the prognosis (outlook) with melanoma. The method was devised by the pathologist Wallace Clark and measures the depth of penetration of a melanoma into the skin according to anatomic layer.
There are five Clark levels of invasion:
Level I: Melanomas...
Clasped thumbs and mental retardation
Clasped thumbs and mental retardation: A syndrome with the following
characteristic features: (1) neurologically: mental retardation and aphasia (lack of
speech); (2) limbs: adducted (clasped) thumbs, absent extensor pollicis longus and/or
brevis muscles to the thumb, shuffling gait, and leg spastic...
Classic typhus: See: Typhus, epidemic....
Classification of diseases
Classification of diseases: See: Disease nomenclature....
Claudication: Limping. The word "claudication" comes from the Latin "claudicare" meaning to limp. The Roman emperor Claudius (who ruled from A.D. 41-54) was so named because he limped, probably because of a birth defect.
Intermittent claudication is an aching, crampy, tired, and sometimes burning p...
Claudication, intermittent: An aching, crampy, tired, and sometimes burning pain in the legs that comes and goes -- it typically occurs with walking and goes away with rest -- due to poor circulation of blood in the arteries of the legs. In very severe claudication the pain is also felt ar rest. Int...
Claudication, venous: Limping and/or pain due to inadequate venous drainage, poor return of blood by the veins of the legs....
Claustrophobia: An abnormal and persistent fear of closed
spaces, of being closed in or being shut in, as in elevators,
tunnels, or any other confined space. The fear is excessive (and
The word "claustrophobia" is an amalgam made from the
Latin "claudere", to shut + the Greek "ph...
Clavicle: The bone extending from the breastbone
(sternum) at the base of the front of the neck to the shoulder....
Clavus: Synonymous with corns. The word "clavus" is the Latin word for nail....
Clay-shoveler's fracture: An uncommon breakage of the
spine of the vertebrae from the lower neck or upper back as a result
Clay-shoveler's fracture usually occurs in laborers who perform
activities involving lifting weights rapidly with the arms extended.
Examples of these activiti...