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