You searched for: “keraunomancy
ceraunomancy, keraunomancy (s) (noun); ceraunomancies, keraunomancies (pl)
Divinations, or telling fortunes, by means of activities in the air: Ceraunomancy involved the action of rain, thunder, lightning, etc.

Ceraunomancy is a form of prophecy involving the interpretation of an omen communicated by thunder.

keraunomancy (s) (noun), keraunomancies (pl)
Divination by interpreting thunder and lightning: Keraunomancy is a form of prophecy involving the interpretation of an omen communicated by thunder. 
This entry is located in the following unit: -mancy, -mancer, -mantic, -mantical (page 8)