Embryo

An embryo is an animal or a plant in its earliest stage of development.

The embryo of vertebrates is defined as the stages between the first
division of the zygote (a fertilized ovum) until it becomes a fetus. An
embryo is called a fetus at a more advanced stage of development and up
until birth or hatching. In humans, this is from the eighth week after
fertilization onward.

In BOTANY, a plant embryo is part of a seed, consisting of precursor tissues
for the leaves, stem (see hypocotyl), and root (see radicle), as well as one
or more cotyledons. Once the embryo begins to germinate — grow out
from the seed — it is called a seedling.

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