The reason that Tibetan Buddhism, which took over Indian Mikkyo, was previously called 'Lamaism' is due to the characteristic that a disciple believes his 'lama' absolutely at the time of transmittal.
インド密教を継承したチベット仏教がかつて「ラマ教」と俗称されたのは、師資相承における「師（ラマ）」に絶対的に帰依する特徴を捉えたものである。