| dioxide | | |
| n. (substance) | 1. dioxide | an oxide containing two atoms of oxygen in the molecule. |
| ~ nitrogen dioxide | a highly poisonous brown gas (NO2). |
| ~ carbon dioxide, carbonic acid gas, co2 | a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis. |
| ~ chlorine dioxide | an explosive gas (ClO2) used chiefly in bleaching paper or starch or soap or flour and in water purification. |
| ~ oxide | any compound of oxygen with another element or a radical. |
| ~ sulfur dioxide, sulphur dioxide | a colorless toxic gas (SO2) that occurs in the gases from volcanoes; used in many manufacturing processes and present in industrial emissions; causes acid rain. |
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