The Collaborative International Dictionary of English v.0.48:

Embryology \Em`bry*ol"o*gy\, n. [Gr. 'e`mbryon an embryo +
   -logy: cf. F. embryologie.] (Biol.)
   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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

embryology
    n 1: the branch of biology that studies the formation and early
         development of living organisms

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "embryology":
   aerobiology, agrobiology, anatomy, astrobiology, bacteriology,
   biochemics, biochemistry, biochemy, bioecology, biological science,
   biology, biometrics, biometry, bionics, bionomics, biophysics,
   botany, cell physiology, cryobiology, cybernetics, cytology,
   ecology, electrobiology, enzymology, ethnobiology, exobiology,
   genetics, gnotobiotics, life science, microbiology,
   molecular biology, pharmacology, physiology, radiobiology,
   taxonomy, virology, xenobiology, zoology