What is the meaning of Radon?

The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.

Radon-222 (86Rn), the most stable isotope of said element.

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accusative singular of rado

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radon (chemical element)

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Rōmaji transcription of ラドン

radon

radon (chemical element)

radon (chemical element)

radon (chemical element, Rn, atomic number 86)

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Source: wiktionary.org