The Collaborative International Dictionary of English v.0.48:
Archegonial \Ar`che*go"ni*al\, a. Relating to the archegonium. Syn: archegoniate, archegonical. [1913 Webster] archegoniateWordNet (r) 3.0 (2006):
archegonial adj 1: of or relating to an archegonium [syn: archegonial, archegoniate]