ˌōəˈgōnēəm noun
Etymology: New Latin, from o- + gonium
1. : the female sexual organ in oogamous algae and fungi that corresponds to the archegonium of ferns and mosses but is unicellular in structure and lacks differentiation into neck and venter and that contains one or more eggs which after fertilization develop into oospores — compare antheridium
2. : one of the descendants of a primordial germ cell that give rise to oocytes