invaginate verb 3adjective 2forms 3 verb3 •To fold up or enclose into a sheath-like or pouch-like structure, either naturally or as part of a surgical procedure. •To turn or fold inwardly. •To fold inward to create a hollow space where none had existed, as with a gastrula forming from a blastula. adjective2 •sheathed •Having one portion of a hollow organ drawn back within another portion. formsinvaginated · invaginating · invaginates