#hydrated_oxide__hydroxide  a compound of an oxide with water
  supertype:  #chemical_compound__compound  (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
  subtype:  #aluminum_hydroxide__aluminium_hydroxide__hydrated_aluminum_oxide__hydrated_aluminium_oxide  white crystalline compound that occurs naturally as the mineral gibbsite
  subtype:  #calcium_hydroxide__calciumhydroxide__lime__slaked_lime__hydrated_lime__calcium_hydrate__caustic_lime__causticlime__limehydrate  a caustic substance (Ca(OH)2) produced by heating limestone
  subtype:  #caustic_potash__causticpotash__potash__potassium_hydroxide__potassiumhydroxide  a potassium compound often used in agriculture and industry
  subtype:  #sodium_hydroxide__caustic_soda__causticsoda  a strongly alkaline caustic used in manufacturing soap and paper and aluminum and various sodium compounds

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