curve vs invaginate

curve

verb
  • To bend or turn gradually from a given direction. 

  • To bend; to crook. 

  • To grade on a curve (bell curve of a normal distribution). 

  • (slang) To reject, to turn down romantic advances. 

  • To cause to swerve from a straight course. 

noun
  • A grading system based on the scale of performance of a group used to normalize a right-skewed grade distribution (with more lower scores) into a bell curve, so that more can receive higher grades, regardless of their actual knowledge of the subject. 

  • An algebraic curve; a polynomial relation of the planar coordinates. 

  • A one-dimensional figure of non-zero length; the graph of a continuous map from a one-dimensional space. 

  • A one-dimensional continuum. 

  • A simple figure containing no straight portions and no angles; a curved line. 

  • A gentle bend, such as in a road. 

  • The attractive shape of a woman's body. 

  • A continuous map from a one-dimensional space to a multidimensional space. 

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 

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