#inhibitor  a substance that retards or stops an activity
  exclusion:  activator
  supertype:  substance__matter  that which has mass and occupies space; "an atom is the smallest indivisible unit of matter"
  subtype:  antioxidant  substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides
     subtype:  glutathione_peroxidase__glutathioneperoxidase  an enzyme in the body that is a powerful scavenger of free radicals
     subtype:  selenium__Se__atomic_number_34  a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable gray metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)
     subtype:  carotenoid  any of a class of highly unsaturated yellow to red pigments occurring in plants and animals
        subtype:  carotene  yellow or orange-red fat-soluble pigments in plants
        subtype:  lycopene  carotenoid that makes tomatoes red; may lower the risk of prostate cancer
        subtype:  beta-carotene  an isomer of carotene that is found in dark green and dark yellow fruits and vegetables
        subtype:  xanthophyll__xanthophyl__lutein  yellow carotenoid pigments in plants and animal fats and egg yolks
        subtype:  zeaxanthin  yellow carotenoid (isomeric with lutein and occurs widely with it) that is the main pigment in yellow indian corn
     subtype:  rust_inhibitor  antioxidant that inhibits the formation of rust
     subtype:  beta-naphthol  an isomer of naphthol used in rubber as an antioxidant
     subtype:  vitamin_E__tocopherol__E  a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body
        subtype:  alpha-tocopheral__alphatocopheral  a potent form of vitamin E obtained from germ oils or by synthesis
     subtype:  vitamin_C__ascorbic_acid  a vitamin found in fresh fruits (especially citrus fruits) and vegetables; prevents scurvy
  subtype:  anticatalyst  (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst
  subtype:  moderator.inhibitor  any substance used to slow down neutrons in nuclear reactors
     subtype:  heavy_water__heavywater__deuterium_oxide__deuteriumoxide  water containing a substantial proportion of deuterium atoms, used in nuclear reactors

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