One of the mysteries of the English language finally explained.
An inflammatory disorder of the skin seen chiefly in association with ulcerative colitis and other systemic diseases, characterized by irregular, spreading ulcers, usually on the legs and trunk, showing neutrophilic infiltration of the dermis without bacterial infection.
1930s. From pyoderma + scientific Latin gangrenosum, neuter singular of gangrenosus gangrenous.
pyoderma gangrenosum/ˌpʌɪə(ʊ)ˈdəːmə ˌɡaŋɡrɪˈnəʊzəm/
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