noun, plural ar·che·go·ni·a [ahr-ki-goh-nee-uh] /ˌɑr kɪˈgoʊ ni ə/. Botany.
Origin of archegonium
Examples from the Web for archegonium
The neck of the archegonium is quite long, but does not project above the surface of the prothallium (Fig. 77, H).Elements of Structural and Systematic Botany|Douglas Houghton Campbell
The archegonium (fig. 1) has the form of a narrow flask with a long neck.
The young sporogonium is protected by a thick calyptra derived from the tissue of the thallus around the archegonium.
The fertilized nucleus or germ-cell of the archegonium in Cryptogams, from which the new plant is directly developed.
Spermatozoids are formed in the antheridium, and these enter the archegonium and fertilize the germ cell.The Nursery Book|Liberty Hyde Bailey