Gastromancy definitions

Divination by interpreting the sounds and signs of the belly. It is now sometimes associated as being a form of ventriloquism, where vocal sounds are produced from the belly.
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Divination by noting magical visions in large-bellied glasses. It is sometimes described as a technique where a child is placed in front of a glass filled with water, the images in the glass were then interpreted. Similar to crystallomancy.
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Origin of gastromancy

Ancient Greek γαστρό- stem from the Ancient Greek γαστήρ (gastēr, “belly”), also the wide part of a bottle.