Used to label an unusually large number of occurrances of a disease or condition in one place. An autism cluster would be an unusually large number of cases of autism in (perhaps) a single locality. Clusters constitute evidence in the search for causes of diseases and conditions.
Top definition. jawn. a word used by Philly cats to describe anything and everything. NY cats interject with the word joint but it doesn't convey the same feelings.
The mandible, lower jaw or jawbone (from Latin mandibula, jawbone) is the largest, strongest and lowest bone in the face. It forms the lower jaw and holds the lower teeth in place. The mandible sits beneath the maxilla. The bone is formed from a fusion of left and right processes, and the point where these sides join, the mandibular symphysis, is still visible as a faint ridge in the midline.