1. (Science: dermatology) a spreading, diffuse inflammatory reaction to infection with microaerophilic streptococci, which forms a suppurative or gangrenous and undermining lesion that may extend into deep subcutaneous tissues and muscles, creating multiple small pockets of pus.
Synonym: phlegmonous cellulitis.
Compare: cellulitis, erysipelas.
2. (Science: surgery) a solid, swollen, inflamed mass of pancreatic tissue occurring as a complication of acute pancreatitis, which may subside spontaneously or become secondarily infected and develop into an abscess.
Origin: gr. Phlegmon