Dictionary of Biological Psychology
(from Greek, en: in, bryein: to swell) An organism in the earliest stages of DEVELOPMENT.
During the first 4 weeks of human development the apparently homogenous egg becomes an EMBRYO. Once the principal organs of the body are differentiated and identifiable, even at a rudimentary degree, and the embryo has a human appearance, it is known instead as a FOETUS. The adjective embryonic has a more general (and often imprecise) usage in describing the original stages of things.
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