invaginate vs redound

invaginate

verb
  • To turn or fold inwardly. 

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

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

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

  • sheathed 

redound

verb
  • To roll back; to be sent or driven back. 

  • To reverberate, to echo. 

  • To attach, come back, accrue to someone; to reflect back on or upon someone (of honour, shame etc.). 

  • To arise from or out of something. 

  • To contribute to an advantage or disadvantage for someone or something. 

  • To contribute to the honour, shame etc. of a person or organisation. 

  • To reflect (honour, shame etc.) to or onto someone. 

noun
  • A coming back, as an effect or consequence; a return. 

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