Catoptromancy

Webster's Dictionary

(n.) A species of divination, which was performed by letting down a mirror into water, for a sick person to look at his face in it. If his countenance appeared distorted and ghastly, it was an ill omen; if fresh and healthy, it was favorable.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

( Κάτοπτρον , a Mirror, and Μαντεία , Prophecy ), a species of divination by which objects or persons are alleged to appear to the eyes of a spectator in a mirror. (See Divination).