- embryo, conceptus, fertilized egg - 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
--1 is a kind of animal, animate being, beast, brute, creature, fauna
--1 has parts: umbilical cord
--1 has particulars: blastula, blastodermic vesicle; gastrula; morula