labia majora vs labium

labia majora

noun
  • The two outer rounded folds of adipose tissue that lie on either side of the opening of the vagina. 

labium

noun
  • A liplike structure; especially one of the two pairs of folds of skin on either side of the vulva. 

  • The lip of a labiate corolla. 

  • A liplike part of various invertebrates. 

  • The lip against which pressured air is driven to produce sound in a recorder and in a pipe organ with flue pipes. 

  • A lower mouthpart of an insect that is formed by the second pair of maxillae united in the middle line. 

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