#oil_gland__oilgland  a gland that secretes oil
  supertype:  exocrine_gland__duct_gland  a gland that secretes externally through a duct
  subtype:  uropygial_gland__preen_gland  oil-secreting gland situated at the base of the tail in most birds
  subtype:  sebaceous_gland__sebaceousgland__sebaceous_follicle__sebaceousfollicle__glandulae_sebaceae__glandulaesebaceae  a cutaneous gland that secretes sebum (usually into a hair follicle) for lubricating hair and skin
     subtype:  Meibomian_gland__tarsal_gland  a long sebaceous gland that lubricates the eyelids; "bacterial infection of a Meibomian gland produces a stye"
     subtype:  Montgomery's_tubercle  one of the sebaceous glands on the areolae of the breast that lubricate the breast during breast-feeding

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