Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
radius [ˈreɪdɪəs] (pl radii) n ра́диус; (ANAT) лучева́я кость*f
within a radius of 50 miles в ра́диусе 50-ти миль
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
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