Definition of Embryo

Noun: embryo 'em-bree,ow

An animal organism in the early stages of growth and differentiation that in higher forms merge into foetal stages but in lower forms terminate in commencement of larval life
- conceptus, fertilized egg, fertilised egg [Brit]
(botany) a minute rudimentary plant contained within a seed or an archegonium
An unborn baby less than 8 weeks old, before it is classified as a foetus
The first stage or starting form of anything