1) Fold inwards 2) Sheathe 3) To turn or fold inwardly 1) Intussuscept 
to sheathe; to draw in; to enfold
• (a.) Alt. of Invaginated • (v. t.) To insert as in a sheath; to produce intussusception in.
To ensheathe, infold, or insert a structure within itself or another. ... Origin: L. In, in, + vagina, a sheath ... (05 Mar 2000) ... 
(in-vaj´ĭ-nāt) to infold one portion of a structure within another portion.
The infolding of a portion of an organ within the remainder.
In·vag'i·nate transitive verb To insert as in a sheath; to produce intussusception in. 
Type: Term Pronunciation: in-vaj′i-nāt Definitions: 1. To ensheathe, infold, or insert a structure within itself or another.
[v] - sheathe, as in botany 2. [v] - fold inwards, of certain organs
introvert verb fold inwards; `some organs can invaginate`