#hydrazine  a colorless fuming corrosive liquid; a powerful reducing agent; used chiefly in rocket fuels
  part of:  #rocket_fuel
  supertype:  #reducing_agent__reducer__reductant  a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the slackened silver
     supertype:  #chemical_agent  an agent that produces chemical reactions
        supertype:  #agent.causal_agent  a substance that exerts some force or effect
           supertype:  #causal_agent__cause__causal_agency  any entity that causes events to happen
              supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                 supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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