The Collaborative International Dictionary of English v.0.48:

Introvert \In`tro*vert"\, v. t. [imp. & p. p. Introverted; p.
   pr. & vb. n. Introverting.] [Pref. intro- + L. vertere,
   versum, to turn.]
   [1913 Webster]
   1. To turn or bend inward. "Introverted toes." --Cowper.
      [1913 Webster]

   2. To look within; to introspect. --Lew Wallace.
      [1913 Webster]