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Definition of carbon 14
: a heavy radioactive isotope of carbon of mass number 14 used especially in tracer studies and in dating old materials (such as archaeological and geological specimens)
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carbon 14
noun\ -(ˈ)fōr(t)-ˈtēn, -(ˈ)fȯr(t)- 
\
\Medical Definition of carbon 14
: a heavy radioactive isotope of carbon of mass number 14 used especially in tracer studies and in dating archaeological and geological materials
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The first known use of carbon 14 was in 1946
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