ar·che·go·ni·um \ˌärkə̇ˈgōnēəm\noun (pluralarchego·nia \-nēə\) Etymology: New Latin, from Greek archegonos original, primal (from arche- + -gonos, akin to gignesthai to be born) + New Latin -ium — more at kin : the flask-shaped female sex organ in mosses and ferns and some gymnosperms