choriocarcinoma
Medical term for a malignant tumor of the placenta, often occurring after a molar pregnancy.
Choriocarcinoma can occur after a hydatidiform mole.
Alternate spelling using the kanji 癌 for 'cancer'; less common in modern medical contexts.
From 絨毛 (じゅうもう, 'chorionic villi') + がん ('cancer').