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Silicon dioxide

noun

Definitions

Noun
  1. 1
    A hard glassy mineral, SiO₂, occurring as quartz, sand, opal etc. Informally known as silica. uncountable
  2. 2
    a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite wordnet

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