Pertaining to an embryo; rudimentary; undeveloped; as, an embryo bud.
source: Webster 1913
noun
(botany) a minute rudimentary plant contained within a seed or an archegonium
source: WordNet 3.0
an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life
source: WordNet 3.0
The first rudiments of an organism, whether animal or plant