A swelling or tumor involving the skin and glands (an extremely rare or obsolete medical term).
From Greek 'dera' (skin) + 'aden' (gland) + 'oncus' (swelling/tumor). An archaic medical term combining classical Greek roots, likely abandoned in favor of modern medical terminology.
This might be one of the rarest medical terms in English—it's so obscure that even medical historians might struggle to find historical usage. It's a beautiful example of how medicine invented incredibly specific vocabulary that didn't survive!
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