embryogenesisBiol.|ˌɛmbrɪəʊˈdʒɛnɪsɪs| [mod.f. embryo-n + Gr. γένεσις birth, production.] ‘The origin and formation of the embryo; and the science therof’ (Syd. Soc.Lex.). 1830R. Knox Béclard's Anat. 333 The laws of..embryogenesis.1879De Quatrefages' Human Species 109 Haeckel goes back to embryogenesis.