Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
Admiralty [ˈædmərəltɪ] n (BRIT)
the Admiralty(also: the Admiralty Board) ≈ Адмиралте́йство (вое́нно-морско́е ве́домство)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.