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| 1. | [ noun ] (chemistry) a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health | |
| Synonyms: | atomic_number_86 radon | |
| Related terms: | chemical_element noble_gas | |
| 2. | [ noun ] (medicine,work) a graduate nurse who has passed examinations for registration | |
| Synonyms: | registered_nurse | |
| Related terms: | nurse np nurse-midwife | |
| Similar spelling: |
RNA |
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