An inflammatory bacterial disease of cattle and other animals, sometimes caught by humans, that resembles a fungus and causes swelling of the abdomen, chest, and especially the jaw: Actinomycosis, a chronic disease of cattle, swine, and humans, is characterized by hard granulomatous masses, usually in the mouth and jaw.

It is also distinguished by deep, lumpy abscesses that extrude a yellow, granular pus through multiple sinuses.

This disease occurs worldwide, but is seen most frequently in those who live in rural areas.

A form of actinomycosis, a chronic local or systemic granulomatous infection, an inflammatory lesion which is caused by a fungus; lumpy jaw: Cervicofacial actinomycosis is characterized by slow-growing inflammatory lesions of the lymph nodes that drain the mouth and reddens the overlying skin and causes intraperitoneal abscesses.