#conjunctiva  a transparent membrane covering the eyeball and under surface of the eyelid
  supertype:  mucous_membrane__mucosa  mucus-secreting membrane lining all body cavities or passages that communicate with the exterior
  subtype:  pinguecula  pterygium
  part of:  eye__oculu__optic__peeper  the organ of sight (`peeper' is an informal term for `eye')
     part of:  visual_system  the sensory system for vision
     part of:  human_face__humanface  the front of the head from the forehead to the chin and ear to ear; "he washed his face"; "I wish I had seen the look on his face when he got the news"
        part of:  head__caput  the upper or front part of the body in animals; contains the face and brains; "he stuck his head out the window"
           part of:  animal__animate_being__animatebeing__beast__brute__creature__fauna  a living organism characterized by voluntary movement
  part of:  eyelid__lid  either of two folds of skin that can be moved to cover or open the eye; "his lids would stay open no longer"
     part of:  eye__oculu__optic__peeper  the organ of sight (`peeper' is an informal term for `eye')

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