#sterility__infertility  the state of being unable to produce offspring; in a woman it is an inability to conceive; in a man it is an inability to impregnate
  exclusion:  #fertility
  supertype:  #physiological_state__physiologicalstate__physiological_condition__physiologicalcondition  the condition of the body or bodily functions
  subtype:  #impotence__impotency  an inability (usually of a male) to copulate
     subtype:  #erectile_dysfunction__male_erecticle_dysfunction__ED  impotence resulting from a man's inability to have or maintain an erection of his penis
  subtype:  #barrenness  the state (usually of a woman) of having no children or being unable to have children
  subtype:  #cacogenesis  inability to produce hybrids that are both viable and fertile
  subtype:  #dysgenesis  infertility between hybrids

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