(zoology) 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.

(psychology) 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.

(figurative, proscribed) A reserved person.

Turn inward, either in terms of thinking about internal or spiritual matters or withdrawing an organ or body part within itself or its base.

Alternative form of introverted.