noun.
The branch of biology that deals with the formation, early growth, and development of living organisms.
noun.
The embryonic structure or development of a particular organism.
The Century Dictionary and Cyclopedia
noun.
That department of science which relates to the development of embryos.
the GNU version of the Collaborative International Dictionary of English
noun.
The science which relates to the formation and development of the embryo in animals and plants; a study of the gradual development of the ovum until it reaches the adult stage.