cluster
(klŭs'tĕr 
)
A closely grouped series of events, e.g., cases of a disease, that share a common risk factor or occur around the same time or in the same place.
cancer c.The occurrence of many cancers in a small geographical area or a defined population in much greater numbers than would be expected through chance alone.
ABBR: CD
Any of a group of cell surface protein markers on the white blood cells. These markers are used to classify immune cell types and establish international nomenclature stand ards. The markers are found on many blood cells and some nonblood cells but are used most often to refer to lymphocytes. The markers may be identified by specific monoclonal antibodies and are used to designate cell populations, e.g., CD4 lymphocytes as T helper cells, and CD8 lymphocytes as suppressor T cells. Each marker has a specific function in the cell, such as passing a signal from the T-cell receptor to the cytoplasm. Particular CDs are followed by numbers (CD2, CD3, etc.) and are so listed.SEE: T cell.
suicide c.An epidemic of suicides, within a defined location or a short time.