archegonium
noun
ar·che·go·ni·um ˌär-ki-ˈgō-nē-əm 
plural archegonia ˌär-ki-ˈgō-nē-ə
: the flask-shaped female sex organ of bryophytes, lower vascular plants (such as ferns), and some gymnosperms
archegonial
ˌär-ki-ˈgō-nē-əl
adjective 
Word History
Etymology
New Latin, from Greek archegonos originator, from archein to begin + gonos procreation; akin to Greek gignesthai to be born — more at arch-, kin
First Known Use
1854, in the meaning defined above