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Dictionary

ra•di•um

Pronunciation: (rā'dē-um), [key]
—n.
1. Chem.a highly radioactive metallic element whose decay yields radon gas and alpha rays. Symbol: Ra; at. wt.: 226; at. no.: 88.
2. a lustrous rayon or silk fabric constructed in plain weave and used in women's apparel, lining, and drapery.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

radish

radium A

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