Early 18th century; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster. From ancient Greek πεσσός (Attic πεττός) oval pebble + -mancy.
Definition of pessomancy in US English:
pessomancy
nounˈpɛsə(ʊ)mansi
rare
Divination by means of pebbles.
Origin
Early 18th century; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster. From ancient Greek πεσσός (Attic πεττός) oval pebble + -mancy.