nitrogen dioxide
English Thesaurus
1. a highly poisonous brown gas (NO2) (noun.substance)
| hypernym | : | dioxide, |
| definition | : | an oxide containing two atoms of oxygen in the molecule (noun.substance) |
| hypernym | : | gas, |
| definition | : | a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely (noun.substance) |
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