deciduosis

de·cid·u·o·sis -'wō-səs n, pl -o·ses -.sēz the occurrence of decidual tissue in an ectopic site (as the cervix or vagina)

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de·cid·u·o·sis (də-sid″u-oґsis) the presence of decidual tissue or of tissue resembling the endometrium of pregnancy in an ectopic site.