Feminine of ductor, word derived from the latin ductor ductoris: driver, guide, head and verb duco ducis ducere duxi ductum which means lead, lead, direct. the SAR admits ductor but not ductora, perhaps by traditional exclusion of women that not assigned functions you rectoras, but things are changing; However, institutions are slow and are always behind the facts, said Augusto Comte XIX century French philosopher to dealing with relations between the order and progress.
