crooked vs sigmoid

crooked

adj
  • Not straight; having one or more bends or angles. 

  • Set at an angle; not vertical or square. 

  • Dishonest or illegal; corrupt. 

sigmoid

adj
  • Curved in two directions, like the letter "S", or the Greek ς (sigma); having a serpentine shape. 

  • Relating to the sigmoid colon. 

  • Exhibiting logistic growth; having a graph that accelerates until it reaches a carrying capacity. 

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