An organ or other body part that is or can be turned inside out, especially an anterior portion of some annelid worms capable of retraction.
An introverted person: one who is considered more thoughtful than social, with a personality more inwardly than outwardly directed; one who often prefers to have time in non-social situations.
A reserved person.
To withdraw an organ or body part within itself or its base.
To think about internal or spiritual matters.