Invaginate

Full definition of invaginate

Verb

1. (medicine, surgery) To fold up or enclose into a sheath-like or pouch-like structure, either naturally or as part of a surgical procedure.
2. (medicine) To turn or fold inwardly.
3. (medicine) Infolding to create a hollow space where none had existed, as with a gastrula forming from a blastula.

Adjective

1. (biology) sheathed
2. (biology) Having one portion of a hollow organ drawn back within another portion.----