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English definition of “roentgen”

roentgen

noun [C] (also röntgen)     /ˈrɒnt.ɡən/ US  /ˈrent-/ specialized
a unit of measurement for showing the amount of radiation received by a person over a period of timeMiscellaneous units of measurement
(Definition of roentgen noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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