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.
Hymen. The hymen is a membrane that surrounds or partially covers the external vaginal opening. It forms part of the vulva, or external genitalia, and is similar in structure to the vagina.In children, although a common appearance of the hymen is crescent-shaped, many shapes are possible.iktionary (0.00 / 0 votes) Rate this definition: hymen (Noun). A mucous membrane which completely or partially occludes the vaginal opening in human females. Hymen (ProperNoun). The god of marriage and marriage ceremonies.