quill feather vs rectrix

quill feather

noun
  • Any of the larger wing or tail feathers of a bird; sometimes termed a flight feather. 

rectrix

noun
  • A flight feather on the tails of birds, used for directional control. 

  • A governess; a rectoress. 

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