Source : Webster's Revised Unabridged Dictionary (1913)

Invaginate \In*vag"i*nate\, v. t.
   To insert as in a sheath; to produce intussusception in.

Invaginate \In*vag"i*nate\, Invaginated \In*vag"i*na`ted\, a.
   (Biol.)
   (a) Sheathed.
   (b) Having one portion of a hollow organ drawn back within
       another portion.

Source : WordNet®

invaginate
     v 1: sheathe; "The chrysalis is invaginated"
     2: fold inwards; "some organs can invaginate" [syn: {introvert}]