An adenocarcinoma that arises from the ovary and is characterized by the presence of malignant epithelial cells that, in well differentiated tumors, resemble the epithelium of the fallopian tube or, in poorly differentiated tumors, show anaplastic features and marked nuclear atypia. The disease is Monarch Disease Ontology entry MONDO_0005211 (ovarian serous adenocarcinoma). Also known as: ovarian serous carcinoma, ovary serous adenocarcinoma, serous adenocarcinoma of ovary, serous adenocarcinoma of the ovary, serous carcinoma of ovary, serous carcinoma of the ovary.