(κατοπτρον a mirror, and μαντεία divination), a species of divination among the ancients by means of a mirror. Pausanias says, that among the Achaeans if a person were sick he let down a mirror by a thread into a fountain before the temple of Ceres, and looking in the glass, if he saw a distorted ghastly face he regarded it as an ill omen; but if the face appeared fresh and healthy it was a token of recovery.