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Dictionary

ra•don

Pronunciation: (rā'don), [key]
—n. Chem.
a chemically inert, radioactive gaseous element produced by the decay of radium: emissions produced by outgassing of rock, brick, etc. are a health hazard. Symbol: Rn; at. no.: 86; at. wt.: 222.

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

radome

rad/s

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