#oxide  any compound of oxygen with another element or a radical
  supertype:  #chemical_compound__compound  (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
  subtype:  #titanium_dioxide__titanium_oxide__titanic_oxide__titanicoxide__titania  a white powder used as a pigment for its high covering power and durability
  subtype:  #pentoxide  an oxide containing five atoms of oxygen in the molecule
  subtype:  #nitrogen_oxide  any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials; present in car exhausts
  subtype:  #hydrogen_peroxide__peroxide  a viscous liquid with strong oxidizing properties; a powerful bleaching agent; also used as a disinfectant and (in strong concentrations) as an oxidant in rocket fuels
  subtype:  #calcium_oxide__quicklime__lime__calx__calcined_lime__calcinedlime__fluxing_lime__fluxinglime__unslakedlime__burnt_lime__burntlime  a white crystalline oxide used in the production of calcium hydroxide
  subtype:  #copper_oxide  an oxide of copper
  subtype:  #dioxide  an oxide containing two atoms of oxygen in the molecule
     subtype:  #nitrogen_dioxide  a highly poisonous brown gas (NO2)
     subtype:  #carbon_dioxide__CO__carbonic_acid_gas  a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis
        subtype:  #chokedamp__blackdamp  the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life
     subtype:  #chlorine_dioxide  an explosive gas (ClO2) used chiefly in bleaching paper or starch or soap or flour and in water purification
     subtype:  #sulfur_dioxide__sulphur_dioxide__sulphurdioxide  a toxic gas (SO2) that occurs in the gases from volcanoes; used in many manufacturing processes and present in industrial emissions
  subtype:  #ferric_oxide  a red oxide of iron
     subtype:  #rust.ferric_oxide  a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture
  subtype:  #monoxide  an oxide containing just one atom of oxygen in the molecule
     subtype:  #carbon_monoxide_gas__carbonmonoxidega__carbon_monoxide  an odorless very poisonous gas that is a product of incomplete combustion of carbon
  subtype:  #peroxide  an inorganic compound containing the divalent ion -O-O-
     subtype:  #benzoyl_peroxide__benzoylperoxide  a white crystalline peroxide used in bleaching (flour or oils or fats) and as a catalyst for free radical reactions
  subtype:  #red_lead__redlead__minium  a reddish oxide of lead (Pb3O4) used as a pigment in paints and in glass and ceramics
  subtype:  #silica__silicon_oxide__siliconoxide__silicon_dioxide__silicondioxide  a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechartelierite
     subtype:  #chert  variety of silica containing microcrystalline quartz
        subtype:  #taconite  a variety of chert containing magnetite and hematite; mined as a low-grade iron ore
     subtype:  #flint  a hard kind of stone; a form of silica more opaque than chalcedony
        subtype:  #gunflint  the piece of flint that provides the igniting spark in a flintlock weapon
        subtype:  #firestone.flint  a piece of flint that is struck to light a fire
        subtype:  #flintstone  pebbles of flint used in masonry construction
     subtype:  #silex  a pure form of finely ground silica
  subtype:  #sulfur_oxide__sulphur_oxide__sulphuroxide  any of several oxides of sulphur
  subtype:  #superoxide  a metallic oxide containing the univalent anion O2-
  subtype:  #trioxide  an oxide containing three atoms of oxygen in the molecule
     subtype:  #arsenic_trioxide__arsenictrioxide__arsenic__arsenous_anhydride__arsenous_oxide  a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide and weed killer
  subtype:  #zinc_oxide__flowers_of_zinc__philosopher's_wool__philosopher'swool  oxide of zinc; a white powder used as a pigment or in cosmetics or glass or inks and in zinc ointment
  subtype:  #zirconium_oxide__zirconiumoxide__zirconia__zirconium_dioxide  a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes

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