(botany) a minute rudimentary plant contained within a seed or an archegonium
"The botanist carefully sliced open the pod to reveal the tiny embryo nestled inside the seed."
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
"The researcher carefully monitored the sea urchin embryo as it transitioned from its early developmental stage directly into its free-swimming larval form."
In the reproductive cycle, the stage after the fertilization of the egg that precedes the development into a fetus.
"After confirming the positive pregnancy test, the doctor scheduled an ultrasound to check on the developing embryo in the first trimester."