A guide or conductor of spirits or souls to the other world.
-- William Whitney's Century Dictionary, 1889
There's a cool-sounding word! I think it should be brought back! It ought to have a new meaning, though... I'm thinking along the lines of "totally flamboyant and insane". For example: "The Rocky Horror Picture Show and Willy Wonka and the Chocolate Factory are perfect examples of psychopomp cinema."
What do you think, sirs?