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The Collaborative International Dictionary
Enoptomancy

Enoptomancy \En*op"to*man`cy\, n. [Gr. ? visible in (a thing) + -mancy.] Divination by the use of a mirror.

Douglas Harper's Etymology Dictionary
enoptomancy

divination by means of a mirror, 1855, from Greek enoptos, literally "seen in," from en- "in" (see in) + optos "seen, visible" (see optic) + -mancy.