radon
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dɒn
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To radon
Collins
World English Dictionary
radon (ˈreɪdɒn) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —n | |
| a colourless radioactive element of the rare gas group, the most stable isotope of which, radon-222, is a decay product of radium. It is used as an alpha particle source in radiotherapy. Symbol: Rn; atomic no: 86; half-life of 222Rn: 3.82 days; valency: 0; density: 9.73 kg/m³; melting pt: --71°C; boiling pt: --61.7°C | |
| [C20: from | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Radon
is always a great word to know.
So is interrobang. Does it mean:
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| a chattering or flighty, light-headed person. |
Dictionary.com's 21st Century Lexicon
| Main Entry: | radon |
| Part of Speech: | n |
| Definition: | See radon gas |
Etymonline
Word Origin & History
radon
heaviest gaseous element, 1918, from Ger. Radon (C. Schmidt, 1918), from radium (q.v.) + -on suffix of inert gases (neon, argon, etc.). The element is formed by radioactive decay of radium.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary
radon ra·don (rā'dŏn)
n.
Symbol Rn
A radioactive, largely inert gaseous element formed by the radioactive decay of radium and used as a radiation source in radiotherapy and research; its most stable isotope is Rn 222 with a half-life of 3.82 days. Atomic number 86; melting point -71°C; boiling point -61.7°C; specific gravity (solid) 4.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
radon  (rā'dŏn) Pronunciation Key
Symbol Rn A colorless, odorless, radioactive element in the noble gas group. It is produced by the radioactive decay of radium and occurs in minute amounts in soil, rocks, and the air near the ground. Radon is used as a source of radiation for the treatment of cancer and other diseases. Its most stable isotope is Rn 222 with a half-life of 3.82 days. Atomic number 86; melting point -71°C; boiling point -61.8°C; specific gravity (solid) 4. See Periodic Table. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
radon [(ray-don)]A colorless, odorless, radioactive gas that is produced by the decay of radium in the soil.
Note: Radon seeping through the ground and into buildings is a major source of indoor air pollution and may represent a significant risk for lung cancer.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Radon is a naturally-occurring radioactive gas that may cause cancer, and may be found in drinking water and indoor air.
Radon is a radioactive gas that comes from the natural decay of uranium that is found in nearly all soils.
Exposure to radon is the second leading cause of lung cancer after smoking.
Radon is a radioactive gas that cannot be seen, smelled or tasted.
Nearby Words
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