Having one portion of a hollow organ drawn back within another portion.
sheathed
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.
Located directly across from something else, or from each other.
Facing in the other direction.
Of leaves and flowers, positioned directly across from each other on a stem.
Of either of two complementary or mutually exclusive things.
Extremely different; inconsistent; contrary; repugnant; antagonistic.
Facing, or across from.
In a complementary role to.
On another channel at the same time.
Something opposite or contrary to something else.
An opponent.
A person or thing that is entirely different from or the reverse of someone or something else; used to show contrast between two people or two things.
An antonym.
An additive inverse.
In an opposite position.