trioxide

/traɪˌɑkˈsaɪd/
IPA guide

Definitions of trioxide
  1. noun
    an oxide containing three atoms of oxygen in the molecule
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    types:
    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
    type of:
    oxide
    any compound of oxygen with another element or a radical
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