Definition of "outpocketing" [outpocketing]

• In embryology, eversion or pushing out of a hollow sack-like or pocket-like structure; evagination. (noun)

The Century Dictionary (Public Domain)

• "The reason lies in the way our eye is formed, as an outpocketing of the cortex of the brain."
• "The other is the posterior pituitary, which originates as an outpocketing of the developing brain."
• "One is the anterior pituitary, which originates as an outpocketing of the embryonic mouth cavity."