Definitions

1. adjective

relating to the head and nasal cavity, especially in reference to the embryonic development of vertebrates.

“The cephalonasal axis plays a crucial role in the formation of the brain and face during embryonic development.”

2. noun

a region or axis in the embryonic development of vertebrates that gives rise to the head and nasal cavity.

“The cephalonasal plate is a key structure in the development of many animal species.”