| query | H_______ is a colourless gas that is the lightest and commonest element in the universe.Hydrogen is a colourless gas that is the lightest and commonest element in the universe. |
|---|---|
| word | hydrogen |
| full-definition | noun Hydrogen is a colourless gas that is the lightest and commonest element in the universe. |
| cefr-level | C1 |
Tags: oxford5k::cefr-level:c1
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