sheathed
Having one portion of a hollow organ drawn back within another portion.
To fold inward to create a hollow space where none had existed, as with a gastrula forming from a blastula.
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.
Opposite.
Being, of having an opponent; not unopposed.
Acting in opposition; opposing.