Definition of sievert noun from the Oxford Advanced Learner's Dictionary

 

sievert

 noun
noun
BrE BrE//ˈsiːvət//
 
; NAmE NAmE//ˈsiːvərt//
 
(abbreviation Sv)(physics)
 
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a unit for measuring the effect of radiation Word Origin 1940s: named after Rolf M. Sievert (1896–1966), Swedish physicist.
See the Oxford Advanced American Dictionary entry: sievert