cable tray vs ductus

cable tray

noun
  • A rigid structure to support electric cables; a type of raceway, normally having the appearance of a ladder and open at the top to facilitate changes. 

ductus

noun
  • a duct, tube or canal in the body 

  • a subtle reduction of weight towards the middle of the stroke of the letter 

  • the number of strokes that make up a written letter, and the direction, sequence and speed in which they are written (Compare graph; see also aspect.) 

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