ra·di·o·car·bon

[rey-dee-oh-kahr-buhn]
noun Chemistry.
1.
Also called carbon 14. a radioactive isotope of carbon with mass number 14 and a half-life of about 5730 years: widely used in the dating of organic materials.
2.
any radioactive isotope of carbon.

Origin:
1935–40; radio- + carbon

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
radiocarbon (ˌreɪdɪəʊˈkɑːbən) [Click for IPA pronunciation guide]
 
n
See carbon a radioactive isotope of carbon, esp carbon-14

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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00:10
Radiocarbon is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
American Heritage
Science Dictionary
radiocarbon   (rā'dē-ō-kär'bən)  Pronunciation Key 
A radioactive isotope of carbon, especially carbon 14. Other radiocarbons include carbon 10, carbon 11, carbon 15, and carbon 16.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The absolute age of each layer can be dated by radiocarbon methods.
But the newfound corn remains revealed a lot, via radiocarbon dating and other
  tests.
Radiocarbon dating of the drawings or nearby bear bones may provide a more
  accurate estimate of when these ancient artists lived.
They estimated the age of the cores using radiocarbon dating and other
  techniques.
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