Definitions

1. adjective

relating to or derived from the outer layer of cells in an embryo, especially the ectoderm, before it has begun to differentiate into its component tissues.

“The exodermal cells of the embryo begin to form the skin and nervous system.”

2. noun

the outer layer of cells in an embryo, especially the ectoderm, before it has begun to differentiate into its component tissues.

“The exodermal layer of the embryo is crucial for its development.”