A chronic infectious disease of cattle and man due to infection with actinomycetes, especially by
Actinomyces bovis in cattle and by
Actinomyces israeli or
Arachnia propionica in man. It is characterized by hard swellings usually in the mouth and jaw. In man the disease may also affect the abdomen or thorax. Called also
lumpy jaw or
big jaw. [
Webster 1913 Suppl.]