feathering vs rectrix

feathering

noun
  • A feathered texture. 

  • Plumage. 

  • The fitting of feathers to arrows. 

  • Visible offshoots of the trails of ink written on overly absorbent paper. 

  • An arrangement of small arcs or foils separated by projecting cusps, frequently forming the feather-like ornament on the inner mouldings of arches. 

rectrix

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

  • A governess; a rectoress. 

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