cleft vs convex

cleft

noun
  • An opening, fissure, or V-shaped indentation made by or as if by splitting. 

  • A piece made by splitting. 

  • A disease of horses; a crack on the band of the pastern. 

adj
  • split, divided, or partially divided into two. 

verb
  • To syntactically separate a prominent constituent from the rest of the clause that concerns it, such as threat in "The threat which I saw but which he didn't see, was his downfall." 

convex

adj
  • arranged such that for any two points in the set, a straight line between the two points is contained within the set. 

  • Curved or bowed outward like the outside of a bowl, circle, or sphere. 

  • having no internal angles greater than 180 degrees. 

  • having an epigraph that is a convex set. 

noun
  • A playing card made convex for use in cheating. 

  • A small convex mirror used to cheat by observing other players' cards. 

  • Any convex body or surface. 

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