Dictionary of Human Evolution and Biology

  • -id > 9:3


The advanced zygote. The embryo arises from the embryonic disk and is considered to be an embryo after the three primary germ layers have developed, and before all the rudimentary organs are present. Prior to that stage it is a preembryo. In humans, the embryo exists during the embryonic stage.

Cf. fetus.

Full-Text Search Entries

Suggestions from Other Sources

From "Dictionary of Nursing and Individual Health Care"