trioxide

Noun
  1. An oxide containing three atoms of oxygen in the molecule (synset 115104492)
    is a type of: oxide - any compound of oxygen with another element or a radical
    subtypes: arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, ratsbane, white arsenic - a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer

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