From HomoExcelsior

1. An organism in its early stages of development, especially before it has reached a distinctively recognizable form.
2. An organism at any time before full development, birth, or hatching.
3. The fertilized egg of a vertebrate animal following cleavage.
4. In human beings, the prefetal product of conception from implantation through the eighth week of development.
5. The minute, rudimentary plant contained within a seed or an archegonium.
6. Economist