em·bry·ol·o·gy 
(ĕm′brē-ŏlə-jē)
(ĕm′brē-ŏlə-jē)n.
1. The branch of biology that deals with the formation, early growth, and development of living organisms.
2. The embryonic structure or development of a particular organism.
em′bry·o·logic (-ə-lŏjĭk), em′bry·o·logi·cal adj.
em′bry·o·logi·cal·ly adv.
em′bry·olo·gist n.