ʾōv אוֹב ‘medium’ (Hebrew)

Etymology^?: from the same as ʾāv אָב ‘father’ (apparently through the idea of prattling a father's name)
Roots: אב

ʾōv n, m
1) water skin bottle
2) necromancer
 1b) necromancer, one who evokes the dead
 1c) ghost, spirit of a dead one
 1d) practice of necromancy
3) one that has a familiar spirit