ar·che·go·ni·um 
(är′kĭ-gōnē-əm)
(är′kĭ-gōnē-əm)n. pl. ar·che·go·ni·a (-nē-ə)
A multicellular, often flask-shaped, egg-producing organ occurring in mosses, liverworts, ferns, and most gymnosperms.
[New Latin, from Greek arkhegonos, original : arkhe-, arkhi-, archi- + gonos, offspring; see genə- in the Appendix of Indo-European roots.]
ar′che·goni·al adj.
ar′che·goni·ate (-ĭt) adj.