evaginate vs invaginate

evaginate

verb
  • To evert a bodily organ inside surface to outside. 

  • To cause (a bodily organ or part) to turn inside out. 

adj
  • Protruded, or grown out, as an evagination; turned inside out; unsheathed; evaginated. 

invaginate

verb
  • To fold up or enclose into a sheath-like or pouch-like structure, either naturally or as part of a surgical procedure. 

  • To fold inward to create a hollow space where none had existed, as with a gastrula forming from a blastula. 

  • To turn or fold inwardly. 

adj
  • Having one portion of a hollow organ drawn back within another portion. 

  • sheathed 

How often have the words evaginate and invaginate occurred in a corpus of books? (source: Google Ngram Viewer )