noun Chemistry.
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.
any radioactive isotope of carbon.

1935–40; radio- + carbon Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
radiocarbon (ˌreɪdɪəʊˈkɑːbən)
See carbon a radioactive isotope of carbon, esp carbon-14

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
We don't hear about the flaws in radiocarbon dating.
New radiocarbon dating results support the environmental explanation.
Studies of sediment and radiocarbon dating showed the bone's age.
They dazzled us with their fancy fossils, their radiocarbon dating and their
  tens of thousands of peer-reviewed journal articles.
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