extraovarian UK /ˌɛk.strəˌəʊˈvɛəɹi.ən/US /ˌɛk.strəˌoʊˈvɛɹi.ən/ adjective1 •Outside the ovary.At mid-pregnancy, feline CLs require extraovarian luteotropic signals which most likely come from the placenta. — 2015