Definition of radiometric adjective from the Oxford Advanced American Dictionary

 

radiometric

 adjective
adjective
NAmE//ˌreɪdioʊˈmɛtrɪk//
 
 
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relating to a measurement of radioactivity
radiometrically
 
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NAmE//ˌreɪdioʊˈmɛtrɪkli//
 
adverb These rocks have been dated radiometrically at two billion years old.
See the Oxford Advanced Learner's Dictionary entry: radiometric