Noah Webster's New International Dictionary of the English Language

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

2. (n.) The young of an animal in the womb, or more specifically, before its parts are developed and it becomes a fetus (see Fetus).

3. (n.) The germ of the plant, which is enclosed in the seed and which is developed by germination.

4. (a.) Pertaining to an embryo; rudimentary; undeveloped; as, an embryo bud.