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.
What is jaw pain? Jaw pain is any kind of pain or discomfort in the jaw area, which includes the lower jaw (mandible, often referred to as the jaw bone), temporomandibular joint (TMJ or jaw joint), and surrounding soft tissues.