Webster’s Revised Unabridged Dictionary · 1913
Embryo
Em′bry·o (ĕm′brĭ·ō), n.; pl. Embryos (#). [F. embryon, Gr. ἔμβρυον, perh. fr. ἐν in (akin to L. ? E. in) + βρύειν to be full of, swell with; perh. akin to E. brew.] (Biol.) The first rudiments of an organism, whether animal or plant; as: (a) The young of an animal in the womb, or more specifically, before its parts are developed and it becomes a fetus (see Fetus). (b) The germ of the plant, which is inclosed in the seed and which is developed by germination.
In embryo, in an incipient or undeveloped state; in conception, but not yet executed. "The company little suspected what a noble work I had then in embryo." Swift.
Em′bry·o, a. Pertaining to an embryo; rudimentary; undeveloped; as, an embryo bud.