Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
subliminal [sʌbˈlɪmɪnl] adj (memory) подсозна́тельный#; (advertising) де́йствующий*на подсозна́ние
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.