Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
doctor [ˈdɔktər] n (MED) врач#; (SCOL) до́ктор#
vt
I doctored his coffee with arsenic я подмеша́л в его́ ко́фе мышья́к
doctor's office (US) враче́бный кабине́т
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.