Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
passive [ˈpæsɪv] adj пасси́вный*пасси́вен (LING) пасси́вный, страда́тельный
n (LING)
the passive страда́тельный зало́г
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.