lanolin vs vitellus

lanolin

noun
  • A greasy yellow substance chemically akin to wax that is secreted from wooly animals, with a variety of uses from rust prevention, lubrication and waterproofing to cosmetics and skin ointments. 

verb
  • To treat with lanolin. 

vitellus

noun
  • The contents or substance of the ovum; egg yolk. 

  • Perisperm in an early condition. 

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