elongate vs hairline

elongate

adj
  • Lengthened, extended, elongated; relatively long and slender. 

verb
  • To become long or longer by being pulled or stretched; to become elongated. 

  • To make long or longer by pulling and stretching; to make elongated. 

hairline

adj
  • very thin, as thin as a hair 

noun
  • A fishing line made from hair. 

  • The line along one's forehead where hair starts growing. 

  • A very thin line in writing, drawing, or typography. 

  • A very thin fissure. 

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