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.
mandible - the jaw in vertebrates that is hinged to open the mouth. jawbone, jowl, lower jaw, lower jawbone, mandibula, mandibular bone, submaxilla. gnathion - the most inferior point of the mandible in the midline. gonion - the craniometric point on either side at the apex of the lower jaw. mandibular notch - small indentation in the middle of the lower jawbone. pogonion - the craniometric point that is the most forward-projecting point on the anterior surface of the chin.