Cluster: In epidemiology, an aggregation of cases of a disease or another health-related condition, such as a cancer or birth defect, closely grouped in time and place. The number of cases in the cluster may or may not exceed the expected number. This is determined by cluster analysis, a set of statistical methods used to analyze clusters.
- Cluster headache
A distinctive episodic syndrome of headaches. The most common cluster headache pattern, acute cluster headache, is characterized by one to three short attacks of pain each day around the eyes, clustered over a stretch of 1 to 2 months, and followed by a pain-free period that averages 1 year. The other main pattern of cluster […]
Cigar: A small roll of tobacco leaf for smoking. The word “cigar,” from the Spanish “cigarro,” first appeared in English in 1730. In 1998, a National Cancer Institute report outlined cause-and-effect connections between cigar smoking and disease, including cancer of the mouth and lungs, heart disease and emphysema, and stressed the danger of secondhand cigar […]
CIC: Completely-in-the-canal (the ear canal). See: Completely-in-the-canal hearing aid. See also: Hearing aid.
- Ci (Curie)
Ci (Curie): Ci is the abbreviation for a Curie, a unit of radioactivity. (Specifically, the quantity of any radioactive nuclide in which the number of disintegrations per second is 3.7 X 10 to the 10th). Named for Marie and Pierre Curie who did pioneering research in radioactivity, distinguished alpha, beta, and gamma radiation, discovered polonium […]
CMG2: Capillary morphogenesis gene 2, a transmembrane protein that is induced during capillary morphogenesis (the development of capillaries). Mutations in CMG2 cause infantile systemic hyalinosis and juvenile hyaline fibromatosis.