proembryo
/prəʊˈɛmbrɪəʊ/Botany
noun
Any of several other embryonic structures or stages of plants; (now) specifically the group of cells formed by the earliest divisions of the spermatophyte zygote, before the embryo proper and the suspensor become differentiated.
Origin
Mid 19th century (in an earlier sense). From pro- + embryo, after German Proembryo.