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di·ox·ide (')dī-'äk-.sīd n an oxide (as carbon dioxide) containing two atoms of oxygen in a molecule
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di·ox·ide (di-okґsīd) 1. a binary compound containing two oxide ions, such as silicon dioxide, SiO2. 2. an oxide of a nonmetal with a valence of four, such as sulfur dioxide, SO2.Medical dictionary. 2011.