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.