introvert

To turn or direct inward.

To concentrate (one’s interests) upon oneself.

To turn (a tubular organ or part) inward upon itself.

An introverted person.

An anatomical structure that is capable of being introverted.

To turn within; direct inward or interiorly.

In zoology, to turn in, or invert; insheathe a part of within another part.

That which is introverted; in zoology, some part or organ which is turned in upon itself, or intus-suscepted.

A person who is introverted; one concerned predominantly with himself or his own feelings. Contrasted with extrovert.

A person who is shy.