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Found one definition

1.                 From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   Millisievert /mˈɪliːzˌiːfɜt/ (mSv /ˈɛm ˌɛsfˈaʊ/) <neut, n, sg>
   millisievert <n>mSv,  /ˈɛm ˌɛsfˈaʊ/
         "vier Millisievert pro Jahr"  - four millisievert per year
    see: Sievert