megagametogenesis
/ˌmɛɡəɡəˌmiːtə(ʊ)ˈdʒɛnɪsɪs/ /ˌmɛɡəˌɡamɪtə(ʊ)ˈdʒɛnɪsɪs/Biology
noun
The process of formation of megagametes.
Origin
1920s; earliest use found in Bulletin of the Torrey Botanical Club. From megagamete + -o- + -genesis, after gametogenesis.