husk vs outer surface

husk

verb
  • To cough, clear one's throat. 

  • To say huskily, to utter in a husky voice. 

  • To remove husks from. 

noun
  • Any form of useless, dried-up, and subsequently worthless exterior of something. 

  • An infection in cattle caused by a species of Dictyocaulus or lungworm 

  • The dry, leafy or stringy exterior of certain vegetables or fruits, which must be removed before eating the meat inside. 

  • The supporting frame of a run of millstones. 

outer surface

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