embryo

n. (pl. -s) 1 a unborn or unhatched offspring. B human offspring in the first eight weeks from conception. 2 rudimentary plant in a seed. 3 thing in a rudimentary stage. 4 (attrib.) Undeveloped, immature.  in embryo undeveloped.  embryonic adj. [greek bruo grow]

n. The first rudiments of an organism, whether animal or plant