Proembryo
Pronunciation : Pro*em"bry*o
Part of Speech : n.
Etymology : [Pref. pro- + embryo. ] (Bot.) (a) The series of cells formed in the ovule of a flowering plant after fertilization, but before the formation of the embryo. (b) The primary growth from the spore in certain cryptogamous plants; as, the proembryo, or proton
Source : Webster's Unabridged Dictionary, 1913