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on·cho·cer·co·ma -'kō-mə n the subcutaneous nodule of onchocerciasis that contains encysted parasites
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on·cho·cer·co·ma (ong″ko-sər-koґmə) [Onchocerca + -oma] a firm, usually freely movable and nontender subcutaneous nodule containing a tangled mass of adult Onchocerca volvulus worms; seen in onchocerciasis.Medical dictionary. 2011.