#labium  any of the four lip-shaped folds of the female vulva
  supertype:  lip  fleshy folds of tissue as those surrounding the mouth
  part of:  vulva
  subtype:  labia_majora__labiamajora  the two outer folds of the vulva
  subtype:  labia_minora__labiaminora  the two inner folds of the vulva

No statement uses or specializes labium; click here to add one.