Dictionary.net

Pertaining to or noting anything in its first rudimentary or undeveloped state. Embryo-buds, spheroidal solid bodies, resembling woody nodules, which are formed in the bark of trees, and capable, under favourable circumstances, of throwing out branches .

The first rudiments of an animal in the womb, before the several members are distinctly formed, after which it is called a foetus; the rudimentary state of a plant within the ovule consequent on fertilization; the beginning or first state of anything, while yet in a rude and undeveloped condition.

An embryo.

The first rudiments of an animal or plant; the first state or beginning of anything; anything before it assumes a distinct form.