Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
original [əˈrɪdʒɪnl] adj (new) оригина́льный*оригина́лен (genuine) по́длинный*по́длинен (imaginative, writer, artist etc) самобы́тный*самобы́тен
n по́длинник, оригина́л
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.