de·cid·u·oma noun \-ˈwō-mə\
plural de·cid·u·oma·ta \-mət-ə\ also de·cid·u·omas
: a mass of tissue formed in the uterus following pregnancy that contains remnants of chorionic or decidual tissue
: decidual tissue induced in the uterus (as by trauma) in the absence of pregnancy
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